NTA JEE Main 8th April 2017 Online - Chemistry

NTA JEE Main 8th April 2017 Online - Chemistry - Question 31

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Excess of NaOH (aq) was added to 100 mL of FeCl$$_3$$ (aq) resulting into 2.14 g of Fe(OH)$$_3$$. The molarity of FeCl$$_3$$(aq) is: (Given the molar mass of Fe = 56 g mol$$^{-1}$$ and molar mass of Cl = 35.5 g mol$$^{-1}$$)

A

0.3 M

B

0.2 M

C

0.6 M

D

1.8 M

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 32

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If the shortest wavelength in Lyman series of hydrogen atom is $$A$$, then the longest wavelength in Paschen series of He$$^+$$ is:

A

$$\frac{5A}{9}$$

B

$$\frac{36A}{7}$$

C

$$\frac{36A}{5}$$

D

$$\frac{9A}{5}$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 33

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Which of the following is paramagnetic?

A

CO

B

NO$$^+$$

C

$$O_2^{2-}$$

D

$$B_2$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 34

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$$sp^3d^2$$ hybridization is not displayed by

A

$$SF_6$$

B

$$BrF_5$$

C

$$PF_5$$

D

$$[CrF_6]^{3-}$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 35

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Among the following, the incorrect statement is:

A

at low pressure, real gases show ideal behaviour.

B

at very low temperature, real gases show ideal behaviour.

C

at Boyle's temperature, real gases show ideal behaviour.

D

at very large volume, real gases show ideal behaviour.

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 36

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The enthalpy change on freezing of 1 mol of water at 5°C to ice at $$-5$$°C is: (Given $$\Delta_{fus}H = 6$$ kJ mol$$^{-1}$$ at 0°C, $$C_p(H_2O, l) = 75.3$$ J mol$$^{-1}$$ K$$^{-1}$$, $$C_p(H_2O, s) = 36.8$$ J mol$$^{-1}$$ K$$^{-1}$$)

A

6.00 kJ mol$$^{-1}$$

B

5.81 kJ mol$$^{-1}$$

C

5.44 kJ mol$$^{-1}$$

D

6.56 kJ mol$$^{-1}$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 37

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For a reaction, $$A(g) \to A(l)$$; $$\Delta H = -3RT$$. The correct statement for the reaction is:

A

$$\Delta H = \Delta U = 0$$

B

$$|\Delta H| < |\Delta U|$$

C

$$|\Delta H| > |\Delta U|$$

D

$$\Delta H = \Delta U \neq 0$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 38

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Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionization constant of HA is $$10^{-5}$$, the ratio of salt to acid concentration in the buffer solution will be:

A

10 : 1

B

4 : 5

C

5 : 4

D

1 : 10

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 39

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The pair of compounds having metals in their highest oxidation state is:

A

$$Mn_2O_7$$ and $$CrO_2Cl_2$$

B

$$[Fe(CN)_6]^{3-}$$ and $$[Cu(CN)_4]^{2-}$$

C

$$[NiCl_4]^{2-}$$ and $$[CoCl_4]^{2-}$$

D

$$[FeCl_4]^{-}$$ and $$Co_2O_3$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 40

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In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?

A

$$HOCl + H_2O_2 \to H_3O^+ + Cl^- + O_2$$

B

$$I_2 + H_2O_2 + 2OH^- \to 2I^- + 2H_2O + O_2$$

C

$$PbS + 4H_2O_2 \to PbSO_4 + 4H_2O$$

D

$$2MnO_4^- + 3H_2O_2 \to 2MnO_2 + 3O_2 + 2H_2O + 2OH^-$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 41

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A metal M reacts with nitrogen gas to afford $$M_3N$$, $$M_3N$$ on heating at high temperature gives back M and on reaction with water produces a gas B. Gas B reacts with an aqueous solution of CuSO$$_4$$ to form a deep blue compound. M and B respectively are:

A

Li and NH$$_3$$

B

Ba and NH$$_3$$

C

Na and N$$_2$$

D

Al and N$$_2$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 42

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Consider the following ionization enthalpies of two elements 'A' and 'B'.

Element	1st (kJ/mol)	2nd (kJ/mol)	3rd (kJ/mol)
A	899	1757	14847
B	737	1450	7731

Which of the following statements is correct?

A

Both 'A' and 'B' belong to group-1 where 'A' comes below 'B'.

B

Both 'A' and 'B' belong to group-2 where 'A' comes below 'B'.

C

Both 'A' and 'B' belong to group-1 where 'B' comes below 'A'.

D

Both 'A' and 'B' belong to group-2 where 'B' comes below 'A'.

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 43

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Which of the following statements is not true about partition chromatography?

A

Stationary phase is a finely divided solid adsorbent.

B

Separation depends upon equilibration of solute between a mobile and a stationary phase.

C

Mobile phase can be a gas.

D

Paper chromatography is an example of partition chromatography.

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 44

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The IUPAC name of the following compound is:

A

2-Ethyl-1, 1-dimethyl cyclohexane

B

1, 1-Dimethyl-2-ethyl cyclohexane

C

2, 2-Dimethyl-1-1-ethyl cyclohexane

D

1-Ethyl-2, 2-dimethyl cyclohexane

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 45

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Which of the following compounds will not undergo Friedel Crafts reaction with benzene?

A

B

C

D

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 46

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Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

A

$$SO_2$$ and $$O_3$$

B

$$O_3$$ and $$CO_2$$

C

$$SO_2$$ and $$NO_2$$

D

$$CO_2$$ and $$NO_2$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 47

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5 g of Na$$_2$$SO$$_4$$ was dissolved in $$x$$ g of H$$_2$$O. The change in freezing point was found to be 3.82°C. If Na$$_2$$SO$$_4$$ is 81.5% ionised, the value of $$x$$ is approximately: ($$K_f$$ for water = 1.86°C kg mol$$^{-1}$$) (molar mass of S = 32 g mol$$^{-1}$$ and that of Na = 23 g mol$$^{-1}$$)

A

25 g

B

65 g

C

15 g

D

45 g

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 48

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Consider the following standard electrode potentials ($$E°$$ in volts) in aqueous solution:

Element	$$M^{3+}/M$$	$$M^+/M$$
Al	$$-1.66$$	$$+0.55$$
Tl	$$+1.26$$	$$-0.34$$

Based on these data, which of the following statements is correct?

A

$$Tl^+$$ is more stable than $$Al^{3+}$$

B

$$Al^+$$ is more stable than $$Al^{3+}$$

C

$$Tl^{3+}$$ is more stable than $$Al^{3+}$$

D

$$Tl^+$$ is more stable than $$Al^+$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 49

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What is the standard reduction potential ($$E°$$) for $$Fe^{3+} \to Fe$$?
Given that:
$$Fe^{2+} + 2e^- \to Fe$$; $$E°_{Fe^{2+}/Fe} = -0.47$$ V
$$Fe^{3+} + e^- \to Fe^{2+}$$; $$E°_{Fe^{3+}/Fe^{2+}} = +0.77$$ V

A

$$-0.057$$ V

B

$$+0.30$$ V

C

$$-0.30$$ V

D

$$+0.057$$ V

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 50

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The rate of a reaction A doubles on increasing the temperature from 300 to 310 K. By how much, the temperature of reaction B should be increased from 300 K so that rate doubles if activation energy of the reaction B is twice to that of reaction A.

A

4.92 K

B

9.84 K

C

19.67 K

D

2.45 K

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 51

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Among the following, the correct statement is:

A

sols of metal sulphides are lyophilic.

B

Brownian movement is more pronounced for smaller particles than for bigger particles.

C

one would expect charcoal to adsorb chlorine more than hydrogen sulphide.

D

Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 52

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The number of S = O and S - OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are:

A

(2 and 2) and (2 and 4).

B

(4 and 2) and (4 and 2).

C

(4 and 2) and (2 and 4).

D

(2 and 2) and (2 and 2).

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 53

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A solution containing a period-IV cation gives a precipitate on passing H$$_2$$S. A solution of this precipitate in dil. HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:

A

$$Mn^{2+}$$

B

$$Zn^{2+}$$

C

$$Ni^{2+}$$

D

$$Co^{2+}$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 54

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The major product of the following reaction is:

A

$$CH_3CH = CH - CH = CHCH_3$$

B

$$CH_2 = CHCH = CHCH_2CH_3$$

C

$$CH_3CH = C = CHCH_2CH_3$$

D

$$CH_2 = CHCH_2CH = CHCH_3$$

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 55

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The major product of the following reaction is:

A

B

C

D

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 56

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The major product of the following reaction is:

A

B

C

D

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 57

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The major product expected from the following reaction is:

A

B

C

D

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 58

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A mixture containing the following four compounds is extracted with 1 M HCl. The compound that goes to aqueous layer is:

A

IV

B

II

C

I

D

III

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 59

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The reason for "drug induced poisoning" is:

A

binding irreversibly to the active site of the enzyme.

B

binding at the allosteric sites of the enzyme.

C

binding reversibly at the active site of the enzyme.

D

bringing conformational change in the binding site of enzyme.

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NTA JEE Main 8th April 2017 Online - Chemistry - Question 60

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Among the following, the essential amino acid is:

A

Valine

B

Alanine

C

Serine

D

Aspartic acid

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