NTA JEE Main 25th April 2013 Online - Chemistry

NTA JEE Main 25th April 2013 Online - Chemistry - Question 31

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6 litres of an alkene require 27 litres of oxygen at constant temperature and pressure for complete combustion. The alkene is :

A

Ethene

B

Propene

C

1-Butene

D

2-Butene

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 32

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How many grams of methyl alcohol should be added to a 10 litre tank of water to prevent its freezing at 268 K? ($$K_f$$ for water is 1.86 K kg mol$$^{-1}$$)

A

880.07 g

B

899.04 g

C

886.02 g

D

868.81 g

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 33

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10 mL of 2(M) NaOH solution is added to 200 mL of 0.5(M) of NaOH solution. What is the final concentration?

A

0.57(M)

B

5.7(M)

C

11.4(M)

D

1.14(M)

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 34

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Given (A) n = 5, $$m_l$$ = +1 (B) n = 2, $$l$$ = 1, $$m_l$$ = -1, $$m_s$$ = -1/2. The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) are respectively:

A

25 and 1

B

8 and 1

C

2 and 4

D

4 and 1

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 35

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The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJ mol$$^{-1}$$) of C-C, Si-Si and Ge-Ge bonds are respectively ;

A

348, 297, 260

B

297, 348, 260

C

348, 260, 297

D

260, 297, 348

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 36

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Which one of the following cannot function as an oxidising agent?

A

I$$^-$$

B

S(s)

C

NO$$_3^-$$ (aq)

D

Cr$$_2$$O$$_7^{2-}$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 37

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In which of the following sets, all the given species are isostructural?

A

$$CO_2$$, $$NO_2$$, $$ClO_2$$, $$SiO_2$$

B

$$PCl_3$$, $$AlCl_3$$, $$BCl_3$$, $$SbCl_3$$

C

$$BF_3$$, $$NF_3$$, $$PF_3$$, $$AlF_3$$

D

$$BF_4^-$$, $$CCl_4$$, $$NH_4^+$$, $$PCl_4^+$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 38

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The internuclear distances in O-O bonds for $$O_2^+$$, $$O_2$$, $$O_2^-$$ and $$O_2^{2-}$$ respectively are :

A

1.30 $$\text{Å}$$, 1.49 $$\text{Å}$$, 1.12 $$\text{Å}$$, 1.21 $$\text{Å}$$

B

1.49 $$\text{Å}$$, 1.21 $$\text{Å}$$, 1.12 $$\text{Å}$$, 1.30 $$\text{Å}$$

C

1.21 $$\text{Å}$$, 1.12 $$\text{Å}$$, 1.49 $$\text{Å}$$, 1.30 $$\text{Å}$$

D

1.12 $$\text{Å}$$, 1.21 $$\text{Å}$$, 1.30 $$\text{Å}$$, 1.49 $$\text{Å}$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 39

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The structure of which of the following chloro species can be explained on the basis of dsp$$^2$$ hybridization?

A

$$PdCl_4^{2-}$$

B

$$FeCl_4^{2-}$$

C

$$CoCl_4^{2-}$$

D

$$NiCl_4^{2-}$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 40

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Which one of the following is the wrong assumption of kinetic theory of gases?

A

Momentum and energy always remain conserved.

B

Pressure is the result of elastic collision of molecules with the container's wall.

C

Molecules are separated by great distances compared to their sizes.

D

All the molecules move in straight line between collision and with same velocity.

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 41

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In which of the following exothermic reactions, the heat liberated per mole is the highest?

A

$$CaO + H_2O \rightarrow Ca(OH)_2$$

B

$$SrO + H_2O \rightarrow Sr(OH)_2$$

C

$$BaO + H_2O \rightarrow Ba(OH)_2$$

D

$$MgO + H_2O \rightarrow Mg(OH)_2$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 42

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Given that: (i) $$\Delta_f H°$$ of $$N_2O$$ is 82 kJ mol$$^{-1}$$ (ii) Bond energies of $$N \equiv N$$, $$N = N$$, $$O = O$$ and $$N = O$$ are 946, 418, 498 and 607 kJ mol$$^{-1}$$ respectively. The resonance energy of $$N_2O$$ is :

A

-88 kJ

B

-66 kJ

C

-62 kJ

D

-44 kJ

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 43

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The ratio $$\frac{K_p}{K_c}$$ for the reaction $$CO(g) + \frac{1}{2}O_2(g) \rightleftharpoons CO_2(g)$$ is:

A

$$\frac{1}{\sqrt{RT}}$$

B

$$(RT)^{1/2}$$

C

RT

D

1

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 44

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What would be the pH of a solution obtained by mixing 5 g of acetic acid and 7.5 g of sodium acetate and making the volume equal to 500 mL? ($$K_a = 1.75 \times 10^{-5}$$, pK$$_a$$ = 4.76)

A

pH = 4.70

B

pH < 4.70

C

pH of solution will be equal to pH of acetic acid

D

4.76 < pH < 5.0

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 45

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Which one of the following arrangements represents the correct order of the proton affinity of the given species :

A

$$I^- < F^- < HS^- < NH_2^-$$

B

$$HS^- < NH_2^- < F^- < I^-$$

C

$$F^- < I^- < NH_2^- < HS^-$$

D

$$NH_2^- < HS^- < I^- < F^-$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 46

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Given 

In the above compounds correct order of reactivity in electrophilic substitution reactions will be:

A

B > A > C > D

B

D > C > B > A

C

A > B > C > D

D

B > C > A > D

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 47

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Copper crystallises in fcc with a unit length of 361 pm. What is the radius of copper atom?

A

157 pm

B

128 pm

C

108 pm

D

181 pm

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 48

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The Gibbs energy for the decomposition of $$Al_2O_3$$ at 500°C is as follows :
$$\frac{2}{3}Al_2O_3 \rightarrow \frac{4}{3}Al + O_2$$, $$\Delta_r G = +940$$ kJ mol$$^{-1}$$
The potential difference needed for the electrolytic reduction of aluminium oxide at 500°C should be at least :

A

4.5 V

B

3.0 V

C

5.0 V

D

2.5 V

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 49

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A solution of copper sulphate (CuSO$$_4$$) is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at the cathode (at. mass of Cu = 63u) is :

A

0.3892 g

B

0.2938 g

C

0.2398 g

D

0.3928 g

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 50

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A radioactive isotope having a half-life period of 3 days was received after 12 days. If 3 g of the isotope is left in the container, what would be the initial mass of the isotope?

A

12 g

B

36 g

C

48 g

D

24 g

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 51

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In which of the following octahedral complex species the magnitude of $$\Delta_0$$ will be maximum?

A

$$[Co(H_2O)_6]^{2+}$$

B

$$[Co(CN)_6]^{3-}$$

C

$$[Co(C_2O_4)_3]^{3-}$$

D

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

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 52

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In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophile is: $$I^- > Br^- > Cl^-$$. The order of halogens as departing nucleophile should be :

A

Br$$^-$$ > I$$^-$$ > Cl$$^-$$

B

I$$^-$$ > Br$$^-$$ > Cl$$^-$$

C

Cl$$^-$$ > Br$$^-$$ > I$$^-$$

D

Cl$$^-$$ > I$$^-$$ > Br$$^-$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 53

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The major product in the following reaction 

A

B

C

D

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 54

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Cannizaro's reaction is not given by :

A

B

C

$$CH_3CHO$$

D

HCHO

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 55

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Phenol on heating with CHCl$$_3$$ and NaOH gives salicylaldehyde. The reaction is called:

A

Reimer - Tiemann reaction

B

Claisen reaction

C

Cannizzaro's reaction

D

Hell - Volhard - Zelinsky reaction

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 56

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Which of the following reagent(s) used for the conversion?

A

glycol/LiAlH$$_4$$/H$$_3$$O$$^+$$

B

glycol/ NaH/H$$_3$$O$$^+$$

C

LiAlH$$_4$$

D

NaBH$$_4$$

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 57

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Carbylamine forms from aliphatic or aromatic primary amine via which of the following intermediates?

A

Carbanion

B

Carbene

C

Carbocation

D

Carbon radical

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 58

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Which of the following statement is not correct?

A

Amylopectin is a branched polymer of $$\alpha$$-glucose.

B

Cellulose is a linear polymer of $$\beta$$-glucose.

C

Glycogen is the food reserve of plants.

D

All proteins are polymers of $$\alpha$$-amino acids.

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 59

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Bakelite is obtained from phenol by reacting with:

A

Acetal

B

CH$$_3$$CHO

C

HCHO

D

Chlorobenzene

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NTA JEE Main 25th April 2013 Online - Chemistry - Question 60

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Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is :

A

Vitamin A

B

Vitamin B

C

Vitamin D

D

Vitamin C

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