NSEC 2016 27th Nov Question Paper

NSEC 2016 27th Nov - Question 1

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The electrons identified by quantum numbers $$n$$ and $$l$$, (i) $$n=4, l=1$$, (ii) $$n=4, l=0$$, (iii) $$n=3, l=2$$, (iv) $$n=3, l=1$$ can be placed in order of increasing energy from lowest to highest as

A

$$(iv) < (ii) < (iii) < (i)$$

B

$$(ii) < (iv) < (i) < (iii)$$

C

$$(i) < (iii) < (ii) < (iv)$$

D

$$(iii) < (i) < (iv) < (ii)$$

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NSEC 2016 27th Nov - Question 2

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Spodoptol, a sex attractant, produced by a female fall armyworm moth, can be prepared as follows. The structure of Spodoptol is (pKa: terminal alkynes about 25, alcohols about 17)

A

B

C

D

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NSEC 2016 27th Nov - Question 3

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Passing $$\mathrm{H_2S}$$ gas into a mixture of $$\mathrm{Mn^{2+}}$$, $$\mathrm{Ni^{2+}}$$, $$\mathrm{Cu^{2+}}$$ and $$\mathrm{Hg^{2+}}$$ in an acidified aqueous solution precipitates

A

$$\mathrm{CuS}$$ and $$\mathrm{HgS}$$

B

$$\mathrm{MnS}$$ and $$\mathrm{CuS}$$

C

$$\mathrm{MnS}$$ and $$\mathrm{NiS}$$

D

$$\mathrm{NiS}$$ and $$\mathrm{HgS}$$

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NSEC 2016 27th Nov - Question 4

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Battery acid $$\mathrm{H_2SO_4}$$ has density $$1.285\ \mathrm{g\,cm^{-3}}$$. $$10.0\ \mathrm{cm^3}$$ of this acid is diluted to $$1\ \mathrm{L}$$. $$25.0\ \mathrm{cm^3}$$ of this diluted solution requires $$25.0\ \mathrm{cm^3}$$ of $$0.1\ \mathrm N$$ sodium hydroxide solution for neutralization. The percentage of sulphuric acid by mass in the battery acid is

A

98

B

38

C

19

D

49

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NSEC 2016 27th Nov - Question 5

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The compound that reacts fastest with methylamine is

A

B

C

D

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NSEC 2016 27th Nov - Question 6

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$$\mathrm{HgO}$$ is prepared by two different methods, one showing yellow colour and the other showing red colour. The difference in colour is due to difference in

A

electronic $$d-d$$ transitions

B

particle size

C

Frenkel defect

D

Schottky defect

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NSEC 2016 27th Nov - Question 7

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The pH of a $$1.0 imes10^{-3}\ \mathrm{mol\,L^{-1}}$$ solution of a weak acid $$\mathrm{HA}$$ is $$3.60$$. The dissociation constant of the acid is

A

$$8.4 \times10^{-8}$$

B

$$8.4 \times10^{-6}$$

C

$$8.4 \times10^{-5}$$

D

$$8.4 \times10^{-2}$$

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NSEC 2016 27th Nov - Question 8

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The best sequence of reactions for preparation of the following compound from benzene is

A

(i) $$\mathrm{CH_3COCl/AlCl_3}$$, (ii) oleum, (iii) one mole $$\mathrm{(CH_3)_2CHCl/AlCl_3}$$

B

(i) one mole $$\mathrm{(CH_3)_2CHCl/AlCl_3}$$, (ii) $$\mathrm{CH_3COCl/AlCl_3}$$, (iii) oleum

C

(i) oleum, (iI) $$\mathrm{CH_3COCl/AlCl_3}$$, (iii) one mole $$\mathrm{(CH_3)_2CHCl/AlCl_3}$$

D

(i) one mole $$\mathrm{(CH_3)_2CHCl/AlCl_3}$$, (ii) oleum, (iii) $$\mathrm{CH_3COCl/AlCl_3}$$

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NSEC 2016 27th Nov - Question 9

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Which reaction is spontaneous at all temperatures at standard pressure and concentration?

A

exothermic reaction with a decrease in entropy

B

exothermic reaction with an increase in entropy

C

endothermic reaction with a decrease in entropy

D

endothermic reaction with an increase in entropy

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NSEC 2016 27th Nov - Question 10

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The IUPAC name of the following compound is

A

3-Aminocarbonylpent-1-en-4-yne

B

2-Ethenylbut-3-yn-1-amide

C

2-Ethynylbut-3-en-1-amide

D

3-Aminocarbonylpent-4-en-1-yne

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NSEC 2016 27th Nov - Question 11

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$$\mathrm{NaOH}$$ solution is added dropwise to $$\mathrm{HCl}$$ solution and the conductance of the mixture is measured after addition of each drop. The variation of conductance with volume of $$\mathrm{NaOH}$$ added is as shown in the adjacent graph.

The statement that is not true for the above is

A

decrease in conductance from X to Y is due to decrease in $$[\mathrm{H^+}]$$

B

point Y represents the equivalence point of titration

C

$$\mathrm{Na^+}$$ has the higher equivalence conductance than $$\mathrm{H_3O^+}$$

D

segment YZ represents the conductance due to ions from $$\mathrm{NaCl}$$ and $$\mathrm{NaOH}$$ in solution

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NSEC 2016 27th Nov - Question 12

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A colorless water-soluble compound on strong heating liberates a brown coloured gas and leaves a yellow residue that turns white on cooling. An aqueous solution of the original solid gives a white precipitate with $$(\mathrm{NH_4})_2\mathrm S$$. The original solid is

A

$$\mathrm{Zn(NO_3)_2}$$

B

$$\mathrm{Ca(NO_3)_2}$$

C

$$\mathrm{Al(NO_3)_3}$$

D

$$\mathrm{NaNO_3}$$

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NSEC 2016 27th Nov - Question 13

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The following compounds are heated, (i) $$\mathrm{KNO_3}$$, (ii) $$\mathrm{Cu(NO_3)_2}$$, (iii) $$\mathrm{Pb(NO_3)_2}$$, (iv) $$\mathrm{NH_4NO_3}$$. Which of the following statements is correct?

A

(ii) and (iii) liberate $$\mathrm{NO_2}$$

B

(iv) liberates $$\mathrm{N_2O}$$

C

(i), (ii) and (iii) liberate $$\mathrm{O_2}$$

D

All statements are correct

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NSEC 2016 27th Nov - Question 14

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The diastereoisomer, meaning a stereoisomer that is not a mirror image, of X is

A

B

C

D

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NSEC 2016 27th Nov - Question 15

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Given $$\Delta_rH^\circ=-54.08\ \mathrm{kJ\,mol^{-1}}$$ and $$\Delta_rS^\circ=10.0\ \mathrm{J\,mol^{-1}K^{-1}}$$ at $$25^\circ\mathrm C$$, the value of $$\log_{10}K$$ for the reaction $$A \rightleftharpoons B$$ is

A

3.4

B

10

C

0.53

D

113

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NSEC 2016 27th Nov - Question 16

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Which of the complexes has the magnetic moment of $$3.87\ \mathrm{B.M.}$$?

A

$$[\mathrm{Co(NH_3)_6}]^{3+}$$

B

$$[\mathrm{CoF_6}]^{3-}$$

C

$$[\mathrm{CoCl_4}]^{2-}$$

D

$$[\mathrm{Co(dmg)_2}]$$ square planar complex (dmg = dimethyl glyoxime)

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NSEC 2016 27th Nov - Question 17

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Compound X in the following reaction is

A

B

C

D

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NSEC 2016 27th Nov - Question 18

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A toxic element is to be removed from drinking water by adsorption on activated charcoal. At low concentrations, the rate constant for adsorption is $$1.8 \times10^{-5}\ \mathrm{s^{-1}}$$. The time required to reduce the concentration of the toxic element to $$10\%$$ of its initial concentration is

A

$$1.28 \times10^5\ \mathrm s$$

B

$$5.85 \times10^3\ \mathrm s$$

C

$$1.28 \times10^6\ \mathrm s$$

D

cannot be calculated from the given data

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NSEC 2016 27th Nov - Question 19

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Assuming that Hund's rule is violated by the diatomic molecule $$\mathrm{B_2}$$, its bond order and magnetic nature will be respectively

A

1, diamagnetic

B

1, paramagnetic

C

2, diamagnetic

D

2, paramagnetic

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NSEC 2016 27th Nov - Question 20

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In a cubic crystal structure, divalent metal ion is located at the body-centered position, smaller tetravalent metal ions are located at each corner and $$\mathrm{O^{2-}}$$ ions are located halfway along each edge of the cube. The number of nearest neighbors for oxygen is

A

4

B

6

C

2

D

8

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NSEC 2016 27th Nov - Question 21

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Organic compounds sometimes adjust their electronic as well as steric structures to attain stability. Among the following, the compound having highest dipole moment is

A

B

C

D

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NSEC 2016 27th Nov - Question 22

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Cyanide ion is a very good complexing agent and also functions as a reducing agent. Addition of an aqueous solution of $$\mathrm{KCN}$$ to a solution of copper sulfate yields a white precipitate which is soluble in excess aqueous $$\mathrm{KCN}$$ to form the complex

A

$$[\mathrm{Cu(CN)_4}]^-$$

B

$$[\mathrm{Cu(CN)_4}]^{2-}$$

C

$$[\mathrm{Cu(CN)_4}]^{3-}$$

D

$$[\mathrm{Cu(CN)_4}]^{4-}$$

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NSEC 2016 27th Nov - Question 23

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When a certain metal was irradiated with light of frequency $$3.2 \times10^{16}\ \mathrm{Hz}$$, the photoelectrons emitted had twice the kinetic energy as those emitted when the same metal was irradiated with light of frequency $$2.0 \times10^{16}\ \mathrm{Hz}$$. The threshold frequency $$v_0$$ of the metal is

A

$$2.4 \times10^{16}\ \mathrm{Hz}$$

B

$$8.0 \times10^{16}\ \mathrm{Hz}$$

C

$$8.0 \times10^{15}\ \mathrm{Hz}$$

D

$$7.2 \times10^{16}\ \mathrm{Hz}$$

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NSEC 2016 27th Nov - Question 24

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The major product S of the following reaction sequence is

A

B

C

D

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NSEC 2016 27th Nov - Question 25

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$$1.250\ \mathrm g$$ of metal carbonate $$\mathrm{MCO_3}$$ was treated with $$500\ \mathrm{mL}$$ of $$0.1\ \mathrm M$$ $$\mathrm{HCl}$$ solution. The unreacted $$\mathrm{HCl}$$ required $$50.0\ \mathrm{mL}$$ of $$0.500\ \mathrm M$$ $$\mathrm{NaOH}$$ solution for neutralization. Identify the metal M

A

Mg

B

Ca

C

Sr

D

Ba

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NSEC 2016 27th Nov - Question 26

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An electron beam can undergo diffraction by crystals, proving the wave nature of electrons. The potential required for a beam of electrons to be accelerated so that its wavelength becomes equal to $$0.154\ \mathrm{nm}$$ is

A

$$63.5\ \mathrm V$$

B

$$31.75\ \mathrm V$$

C

$$635\ \mathrm V$$

D

$$127\ \mathrm V$$

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NSEC 2016 27th Nov - Question 27

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A biodegradable alternating copolymer of L-alanine and glycolic acid $$\mathrm{HOCH_2COOH}$$ is

A

B

C

D

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NSEC 2016 27th Nov - Question 28

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In which of the following complexes does the metal ion have the lowest ionic radius?

A

$$[\mathrm{Ti(H_2O)_6}]^{2+}$$

B

$$[\mathrm{V(H_2O)_6}]^{2+}$$

C

$$[\mathrm{Cr(H_2O)_6}]^{2+}$$

D

$$[\mathrm{Mn(H_2O)_6}]^{2+}$$

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NSEC 2016 27th Nov - Question 29

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In cold climate, water in a car radiator freezes and causes damage. Ethylene glycol is used as an antifreezing agent. The amount of ethylene glycol that should be added to $$5\ \mathrm{kg}$$ of water to prevent freezing at $$-7^\circ\mathrm C$$ is, given $$K_f=1.86\ \mathrm{K\,kg\,mol^{-1}}$$ and molar mass of ethylene glycol $$62\ \mathrm{g\,mol^{-1}}$$

A

$$1165\ \mathrm g$$

B

$$46.7\ \mathrm g$$

C

$$116.7\ \mathrm g$$

D

$$93.4\ \mathrm g$$

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NSEC 2016 27th Nov - Question 30

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The ratio of the energy of the electron in the ground state of hydrogen atom to that of the electron in the first excited state of $$\mathrm{Be^{3+}}$$ is

A

$$1\colon4$$

B

$$1\colon8$$

C

$$1\colon16$$

D

$$4\colon1$$

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NSEC 2016 27th Nov - Question 31

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A water-insoluble but organic-solvent-soluble dye is dissolved in three organic solvents and taken in three separating funnels a, b and c. To each solution, water is added, shaken, and kept undisturbed. The solvents in separating funnels a, b and c from the following figures are respectively:

A

$$a: EtOH ; b: CCl_4 ; c: EtOAc$$

B

$$a: CCl_4 ; b: EtOH ; c: EtOAc$$

C

$$a: EtOAc ; b: CCl_4 ; c: EtOH$$

D

$$a: CCl_4 ; b: EtOAc ; c:EtOH$$

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NSEC 2016 27th Nov - Question 32

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P, Q, R and S are four metals whose typical reactions are given below.
(I) Only Q and R react with dilute $$HCL$$ to give $$H_2$$ gas.
(II) When Q is added to a solution containing ions of the other metals, metallic P, R and S are formed.
(III) P reacts with concentrated $$HNO_3$$ but S does not.
The correct order of their reducing character is

A

$$S < P < R < Q$$

B

$$S < R < P < Q$$

C

$$R < Q < P < S$$

D

$$Q < P < S < R$$

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NSEC 2016 27th Nov - Question 33

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The kinetic energy of an electron that has a wavelength of $$10\ \mathrm{nm}$$ is

A

$$2.4 \times10^{-21}\ \mathrm J$$

B

$$4.8 \times10^{-21}\ \mathrm J$$

C

$$2.4 \times10^{-29}\ \mathrm J$$

D

$$4.8 \times10^{-29}\ \mathrm J$$

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NSEC 2016 27th Nov - Question 34

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Which of the following compounds contain three-centered two-electron bonding, (i) $$[\mathrm{BeF_2}]_n$$, (ii) $$[\mathrm{Be(CH_3)_3}]_n$$, (iii) $$[\mathrm{BeCl_2}]_n$$, (iv) $$[\mathrm{BeH_2}]_n$$

A

(i) and (ii)

B

(ii) and (iii)

C

(ii) and (iv)

D

(iii) and (iv)

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NSEC 2016 27th Nov - Question 35

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3-Methylpentane on monochlorination gives four possible products. The reaction follows a free radical mechanism. The relative reactivities for replacement of hydrogen are $$3^\circ\colon2^\circ\colon1^\circ=6\colon4\colon1$$. Relative amounts of A, B, C and D formed are

A

$$6/31,\ 16/31,\ 6/31,\ 3/31$$

B

$$16/31,\ 6/31,\ 6/31,\ 3/31$$

C

$$6/31,\ 16/31,\ 3/31,\ 6/31$$

D

$$6/31,\ 3/31,\ 6/31,\ 16/31$$

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NSEC 2016 27th Nov - Question 36

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White phosphorus on reaction with $$\mathrm{NaOH}$$ gives $$\mathrm{PH_3}$$ and

A

$$\mathrm{Na_2HPO_3}$$

B

$$\mathrm{NaH_2PO_2}$$

C

$$\mathrm{NaH_2PO_3}$$

D

$$\mathrm{Na_3PO_4}$$

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NSEC 2016 27th Nov - Question 37

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Given the $$E_0$$ values for the half reactions:
$$\mathrm{Sn^{4+}+2e^-\rightarrow Sn^{2+}}$$, $$0.15\ \mathrm V$$,
$$\mathrm{Hg_2^{2+}+2e^-\rightarrow2Hg}$$, $$0.92\ \mathrm V$$, and
$$\mathrm{PbO_2+4H^++2e^-\rightarrow Pb^{2+}+2H_2O}$$, $$1.45\ \mathrm V$$,
Which of the following statements is true?

A

$$\mathrm{Sn^{2+}}$$ is a stronger oxidizing agent than $$\mathrm{Pb^{4+}}$$

B

$$\mathrm{Sn^{2+}}$$ is a stronger reducing agent than $$\mathrm{Hg_2^{2+}}$$

C

$$\mathrm{Hg^{2+}}$$ is a stronger oxidizing agent than $$\mathrm{Pb^{4+}}$$

D

$$\mathrm{Pb^{2+}}$$ is a stronger reducing agent than $$\mathrm{Sn^{2+}}$$

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NSEC 2016 27th Nov - Question 38

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For the conversion $$\mathrm{CCl_4(l)\rightarrow CCl_4(g)}$$ at $$1\ \mathrm{bar}$$ and $$350\ \mathrm K$$, the correct set of thermodynamic parameters is, given boiling point of $$\mathrm{CCl_4}$$ is $$77^\circ\mathrm C$$

A

$$\Delta G=0,\ \Delta S =  ^{+}ve$$

B

$$\Delta G=0,\ \Delta S = ^{-}ve$$

C

$$\Delta G=^{-}ve,\ \Delta S=0$$

D

$$\Delta G=^{-}ve \Delta S = ^{+}ve$$

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NSEC 2016 27th Nov - Question 39

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How many isomers are possible for complex $$[\mathrm{Co(ox)_2Cl_2}]^+$$?

A

1

B

3

C

2

D

4

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NSEC 2016 27th Nov - Question 40

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The compound that will not react with silver perchlorate under normal conditions is

A

3-bromocyclopropene

B

tetraethylammonium chloride

C

tetramethylammonium hydroxide

D

polyvinyl chloride

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NSEC 2016 27th Nov - Question 41

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The conductivity of $$0.10 M KCl$$  solution at $$298\ \mathrm K$$ is $$1.29 \times10^{-2}\ \mathrm{S\,cm^{-1}}$$. The resistance of this solution is found to be $$28.44\ \Omega$$. Using the same cell, the resistance of $$0.10 M NH_4 Cl$$ ammonium chloride solution is $$28.50\ \Omega$$. The molar conductivity of ammonium chloride solution in $$\mathrm{S\,cm^2\,mol^{-1}}$$ is

A

0.130

B

13

C

130

D

1300

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NSEC 2016 27th Nov - Question 42

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Consider a compound $$\mathrm{CsXY_2}$$ where X and Y are halogens. Which statements are correct,
(i) X and Y have different oxidation states,
(ii) for Y with lower atomic number than X, X can assume oxidation states higher than normal,
(iii) such compounds exist because $$\mathrm{Cs^+}$$ has a high charge to size ratio.

A

Only (i)

B

(i) and (ii)

C

Only (ii)

D

(i) and (iii)

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NSEC 2016 27th Nov - Question 43

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Match the compounds given in list I with their characteristic reactions in list II

A

1-a, 2-c, 3-d, 4-b

B

1-c, 2-d, 3-b, 4-a

C

1-a, 2-b, 3-c, 4-d

D

1-d, 2-a, 3-b, 4-c

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NSEC 2016 27th Nov - Question 44

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Which of the following statements is not correct regarding galvanic cells?

A

Oxidation occurs at the anode

B

Ions carry current inside the cell

C

Electrons flow in the external circuit from cathode to anode

D

When the cell potential is positive, the cell reaction is spontaneous

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NSEC 2016 27th Nov - Question 45

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L-Fucose with the following planar representation is a sugar component of the determinants of the A, B and O blood groups typing

The open-chain structure of L-Fucose can be represented as

A

B

C

D

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NSEC 2016 27th Nov - Question 46

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In ammonia the bond angle is $$107^\circ48'$$ while in $$\mathrm{SbH_3}$$ the bond angle is about  $$91^\circ18'$$. The correct explanation among the followings is/ are

A

The orbitals of Sb used for formation of the Sb-H bond are almost pure p orbitals

B

Sb has larger size compared to N

C

Sb has more metallic character than N

D

All the statements are correct

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NSEC 2016 27th Nov - Question 47

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Equal masses of ethane and hydrogen gas are present in a container at $$25^\circ\mathrm C$$. The fraction of the total pressure exerted by ethane gas is

A

$$1/2$$

B

$$1/16$$

C

$$15/16$$

D

$$1/8$$

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NSEC 2016 27th Nov - Question 48

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The volume of nitrogen evolved on complete reaction of $$9\ \mathrm g$$ of ethylamine with a mixture of $$\mathrm{NaNO_2}$$ and $$\mathrm{HCl}$$ at $$273^\circ\mathrm C$$ and $$1\ \mathrm{atm}$$ pressure is

A

$$11.2\ \mathrm{dm^3}$$

B

$$5.6\ \mathrm{dm^3}$$

C

$$4.48\ \mathrm{dm^3}$$

D

$$22.4\ \mathrm{dm^3}$$

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NSEC 2016 27th Nov - Question 49

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If a dilute solution of aqueous $$\mathrm{NH_3}$$ is saturated with $$\mathrm{H_2S}$$, then the product formed is

A

$$(\mathrm{NH_4})_2\mathrm S$$

B

$$\mathrm{NH_4HS}$$

C

$$(\mathrm{NH_4})_2\mathrm S_x$$

D

$$\mathrm{NH_4OH+S}$$

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NSEC 2016 27th Nov - Question 50

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Three Faradays of electricity are passed through aqueous solutions of $$\mathrm{AgNO_3}$$, $$\mathrm{NiSO_4}$$ and $$\mathrm{CrCl_3}$$ in three vessels using inert electrodes. The ratio in moles in which Ag, Ni and Cr are deposited is

A

$$1\colon2\colon3$$

B

$$3\colon2\colon1$$

C

$$6\colon3\colon2$$

D

$$2\colon3\colon6$$

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NSEC 2016 27th Nov - Question 51

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Nepetalactone X is isolated as an oil from Catnip.

The number of chiral carbon atoms and the amount of KOH consumed by $$83\ \mathrm{mg}$$ of Nepetalactone are respectively

A

3, 50 mg

B

2, 56 mg

C

3, 56 mg

D

3, 28 mg

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NSEC 2016 27th Nov - Question 52

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Number of P-S single bonds and P-S double bonds( P=S ) in $$\mathrm{P_4S_{10}}$$ are respectively

A

10, 6

B

16, 0

C

14, 2

D

12, 4

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NSEC 2016 27th Nov - Question 53

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If the solubility product of iron(III) hydroxide is $$1.8 \times10^{-37}$$, the pH of a saturated solution of iron(III) hydroxide in distilled water is close to

A

4

B

5

C

7

D

9

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NSEC 2016 27th Nov - Question 54

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An alkyl halide X on reaction with ethanolic sodium hydroxide forms an alkene Y which on further reaction with HBr gives the same alkyl halide. The alkene Y on reaction with HBr and peroxide followed by reaction with Mg metal and then HCN produces an aldehyde Z. Z is

A

B

C

D

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NSEC 2016 27th Nov - Question 55

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$$\mathrm{HClO_4}$$ is a stronger acid than $$\mathrm{HClO}$$. The correct statement is

A

$$\mathrm{ClO_4^-}$$ ion is more stabilized than $$\mathrm{ClO^-}$$

B

$$\mathrm{ClO_4^-}$$ ion has higher hydration energy than $$\mathrm{ClO^-}$$

C

$$\mathrm{HClO_4}$$ is better solvated in water than $$\mathrm{HClO}$$

D

In $$\mathrm{HClO_4}$$, H is attached to Cl, while in $$\mathrm{HClO}$$ it is attached to O

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NSEC 2016 27th Nov - Question 56

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For an elementary rearrangement reaction $$\mathrm{A \tightleftharpoons P}$$, the following data were recorded at $$303\ \mathrm K$$ when $$[\mathrm P]_0=0$$.

If the equilibrium constant is $$1.12$$ at $$303\ \mathrm K$$, the rate constant for the reaction $$\mathrm{P\rightarrow A}$$ is

A

$$0.263\ \mathrm{min^{-1}}$$

B

$$0.294\ \mathrm{min^{-1}}$$

C

$$0.526\ \mathrm{min^{-1}}$$

D

$$0.588\ \mathrm{min^{-1}}$$

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NSEC 2016 27th Nov - Question 57

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Compound P on treatment with $$\mathrm{CH_2N_2}$$ produces compound Q. Compound Q on reaction with HI produces two alkyl iodides R and S. Alkyl iodide S with the higher number of carbon atoms on reaction with KCN followed by hydrolysis gives 3-methylbutanoic acid. Compound P is

A

2-butanol

B

1-butanol

C

2-methyl-2-propanol

D

2-methyl-1-propanol

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NSEC 2016 27th Nov - Question 58

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$$\mathrm{I_2}$$ reacts with aqueous $$\mathrm{Na_2S_2O_3}$$ to give $$\mathrm{Na_2S_4O_6}$$ and $$\mathrm{NaI}$$. The products of reaction of $$\mathrm{Cl_2}$$ with aqueous $$\mathrm{Na_2S_2O_3}$$ are

A

$$\mathrm{Na_2S_4O_6+NaCl}$$

B

$$\mathrm{NaHSO_4+HCl}$$

C

$$\mathrm{NaHSO_3+HCl}$$

D

$$\mathrm{NaHSO_3+NaCl}$$

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NSEC 2016 27th Nov - Question 59

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The standard potentials of the $$\mathrm{MnO_4^-/Mn^{2+}}$$ and $$\mathrm{MnO_2/Mn^{2+}}$$ half cells in acidic medium are $$1.51\ \mathrm V$$ and $$1.23\ \mathrm V$$ respectively at $$298\ \mathrm K$$. The standard potential of the $$\mathrm{MnO_4^-/MnO_2}$$ half-cell in acidic medium at the same temperature is

A

$$5.09\ \mathrm V$$

B

$$1.70\ \mathrm V$$

C

$$0.28\ \mathrm V$$

D

$$3.34\ \mathrm V$$

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NSEC 2016 27th Nov - Question 60

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Aspartame X is an artificial sweetening agent and is 200 times sweeter than sugar. It is an ester of the dipeptide of

A

alanine and phenylalanine

B

aspartic acid and alanine

C

phenylalanine and glycine

D

aspartic acid and phenylalanine

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NSEC 2016 27th Nov - Question 61

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Which one of the following reactions is correct?

A

$$[\mathrm{Fe(CO)_5}]+2\mathrm{NO}\rightarrow[\mathrm{Fe(CO)_2(NO)_2}]+3\mathrm{CO}$$

B

$$[\mathrm{Fe(CO)_5}]+2\mathrm{NO}\rightarrow[\mathrm{Fe(CO)_3(NO)_2}]+2\mathrm{CO}$$

C

$$[\mathrm{Fe(CO)_5}]+3\mathrm{NO}\rightarrow[\mathrm{Fe(CO)_2(NO)_3}]+3\mathrm{CO}$$

D

$$[\mathrm{Fe(CO)_5}]+3\mathrm{NO}\rightarrow[\mathrm{Fe(CO)_3(NO)_3}]+2\mathrm{CO}$$

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NSEC 2016 27th Nov - Question 62

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Standard molar enthalpy of formation of $$\mathrm{CO_2(g)}$$ is equal to

A

Zero

B

The standard molar enthalpy of combustion of carbon, graphite

C

The standard molar enthalpy of combustion of $$\mathrm{C(g)}$$

D

The standard molar enthalpy of combustion of $$\mathrm{CO(g)}$$

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NSEC 2016 27th Nov - Question 63

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The reaction of 1-phenylpropane with limited amount of chlorine in the presence of light gives mainly

A

4-chloropropylbenzene

B

1-chloro-1-phenylpropane

C

3-chloro-1-phenylpropane

D

2-chloro-1-phenylpropane

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NSEC 2016 27th Nov - Question 64

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An ionic solid $$\mathrm{LaI_2}$$ shows electrical conduction due to presence of

A

$$\mathrm{La^{2+}}$$ and $$2\mathrm{I^-}$$

B

$$\mathrm{La^{3+}}$$, $$2\mathrm{I^-}$$ and $$e^-$$

C

$$\mathrm{La^{2+}}$$, $$\mathrm{I_2}$$ and $$2e^-$$

D

$$\mathrm{La^{3+}}$$, $$\mathrm{I_2}$$ and $$3e^-$$

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NSEC 2016 27th Nov - Question 65

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For a gaseous reaction $$\mathrm{A+B\rightarrow Products}$$, the energy of activation was found to be $$2.27\ \mathrm{kJ\,mol^{-1}}$$ at $$273\ \mathrm K$$. The ratio of the rate constant $$k$$ to the frequency factor $$A$$ at $$273\ \mathrm K$$ is

A

0.368

B

3.68

C

4.34

D

0.434

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NSEC 2016 27th Nov - Question 66

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In the case of dibromo derivatives of the following compound, the derivative having highest energy has the bromo substituents in positions

A

1,2

B

2,3

C

4,5

D

1,10

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NSEC 2016 27th Nov - Question 67

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The ionization energy of a certain element is $$412\ \mathrm{kJ\,mol^{-1}}$$. When the atoms are in the first excited state, the ionization energy is only $$126\ \mathrm{kJ\,mol^{-1}}$$. The region of the electromagnetic spectrum in which the wavelength of light emitted in a transition from the first excited state to the ground state is

A

Visible

B

UV

C

IR

D

X-ray

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NSEC 2016 27th Nov - Question 68

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The reaction of an olefin with $$\mathrm{HBr}$$ can proceed by ionic as well as radical mechanism. The reaction in the presence of light takes place by radical mechanism, as

A

the free energy of the reaction in radical mechanism is higher than in ionic mechanism

B

ionic mechanism requires a catalyst while radical mechanism does not

C

in the presence of light the activation energy of the reaction is lower than that for ionic mechanism

D

a radical reaction has very low activation energy as compared to that for the corresponding ionic reaction

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NSEC 2016 27th Nov - Question 69

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The correct statement or statements are,
I. Soap is excellent for cleaning, 100% broken down by bacteria in rivers and hence has no further environmental damaging repercussions.
II. Soap forms an insoluble precipitate or scum when hard water containing calcium and magnesium ions is used.
III. Soaps can be used for cleansing under acidic solutions.

A

Only I

B

Only II

C

Only III

D

I and III

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NSEC 2016 27th Nov - Question 70

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The kinetic data recorded at $$278\ \mathrm K$$ for the reaction $$\mathrm{NH_4^+(aq)+NO_2^-(aq)\rightarrow N_2(g)+2H_2O(l)}$$ are shown in the table.

The kinetic rate expression and the unit of rate constant (k) of the above reaction are respectively

A

$$k[\mathrm{NH_4^+}][\mathrm{NO_2^-}]$$ and $$\mathrm{M\,s^{-1}}$$

B

$$k[\mathrm{NH_4^+}]$$ and $$\mathrm{s^{-1}}$$

C

$$k[\mathrm{NH_4^+}][\mathrm{NO_2^-}]$$ and $$\mathrm{M^{-1}\,s^{-1}}$$

D

$$k[\mathrm{NO_2^-}]$$ and $$\mathrm{s^{-1}}$$

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NSEC 2016 27th Nov - Question 71

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Which of the following statements is not true for $$\mathrm{Ce^{3+}}$$ and $$\mathrm{Yb^{3+}}$$?

A

Both absorb in UV region

B

Both show $$f-f$$ transition

C

Both show $$4f$$ to $$5d$$ transition

D

Both ions are colorless

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NSEC 2016 27th Nov - Question 72

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Complete catalytic hydrogenation of naphthalene gives decalin $$\mathrm{C_{10}H_{18}}$$. The number of isomers of decalin formed and the total number of isomers of decalin possible are respectively

A

$$1,\ 2$$

B

$$2,\ 2$$

C

$$2,\ 4$$

D

$$3,\ 4$$

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NSEC 2016 27th Nov - Question 73

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The mass of argon adsorbed per unit mass of carbon surface is plotted against pressure. Which of the following plots is correct if $$x$$ and $$m$$ represent the masses of argon and carbon respectively?(----represents extrapolated data)

A

B

C

D

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NSEC 2016 27th Nov - Question 74

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In a process, n-propyl chloride is reacted with sodium butanoate in an aqueous medium. After the reaction diethyl ether is added and the solution is shaken. The two layers are separated. The incorrect statement with respect to this procedure is

A

The reaction gives a solid product which precipitates in the aqueous solution

B

The reaction takes place in the aqueous medium

C

The product is extracted in diethyl ether and the organic layer is the upper layer

D

The salt formed in the reaction remains in aqueous medium

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NSEC 2016 27th Nov - Question 75

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Which of the following statements about ammonium cerium(IV) nitrate, $$(\mathrm{NH_4})_2[\mathrm{Ce(NO_3)_6}]$$, is false?

A

$$\mathrm{NO_3^-}$$ acts as a monodentate ligand

B

The Ce atom has a coordination number of 12

C

The shape of the complex ion is icosahedron

D

The solution is used as an oxidizing agent

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NSEC 2016 27th Nov - Question 76

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The correct order of the magnitude of bond energy of the central C-C bond in the following compounds is
(i) $$\mathrm{CH_2=CH-CH=CH_2}$$,         (j) $$\mathrm{Me_3C-CPh_3}$$,         (k) $$\mathrm{MeCO-CO-Me}$$,        (l) $$\mathrm{CH\equiv C-C\equiv CH}$$

A

$$k > i > l > j$$

B

$$j > k > l > i$$

C

$$i > j > k > l$$

D

$$l > i > k > j$$

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NSEC 2016 27th Nov - Question 77

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Which one of the following information about the compounds is correct?

A

I

B

III

C

IV

D

II

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NSEC 2016 27th Nov - Question 78

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The best method of preparation of 2-benzyloxynaphthalene is a base-catalysed reaction of

A

benzyl chloride and 1-naphthol

B

1-chloromethylnaphthalene and phenol

C

1-chloronaphthalene and benzyl alcohol

D

benzyl alcohol and 1-naphthol

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NSEC 2016 27th Nov - Question 79

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The pair that is isostructural, meaning having the same shape and hybridization, is

A

$$\mathrm{NF_3}$$ and $$\mathrm{BF_3}$$

B

$$\mathrm{BF_4^-}$$ and $$\mathrm{NH_4^+}$$

C

$$\mathrm{BCl_3}$$ and $$\mathrm{BrCl_3}$$

D

$$\mathrm{NH_3}$$ and $$\mathrm{NO_3^-}$$

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NSEC 2016 27th Nov - Question 80

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A group which departs from the substrate in a nucleophilic substitution reaction is called a leaving group. The ease of departure is determined by the acidity of the conjugate acid of the leaving group; higher the acidity, better the leaving group. The correct order of reactivity of the following compounds in a given nucleophilic reaction is

A

$$\mathrm{R-Cl > R-OCOCH_3 > R-OSO_2CH_3 > RI}$$

B

$$\mathrm{R-OSO_2CH_3 > R-Cl > R-OCOCH_3 > ROH}$$

C

$$\mathrm{R-I > RNH_2 > R-OCOCH_3 > R-OSO_2CH_3}$$

D

$$\mathrm{R-Br > R-OSO_2CH_3 > R-OCOCH_3 > ROCH_3}$$

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