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JEE Chemistry Solved Question Paper 2011

Multiple Choice Questions

Arrange the following in the order of increasing mass (atomic mass O = 16, Cu = 63, N = 14)

I. One atom of oxygen

II. One atom of nitrogen

III. 1 × 10^-10 mole of oxygen

IV. 1 × 10^-10 mole of copper

II < I < III < IV
I < II < III < IV
III < II < IV < I
II < IV < I < III

Which transition in the hydrogen atomic spectrum will have the same wavelength as the transition will have the same wavelength, n = 4 to n = 2 of He⁺ spectrum?

n = 4 to n = 3
n = 2 to n = 1
n = 4 to n = 2
n = 3 to n = 1

3.
Which of the following is not correct with respect to bond length of the species?

C₂ > $C_{2}^{2 -}$

$B_{2}^{+}$ > B₂

${Li}_{2}^{+}$ > Li₂

O₂ > O $_{2}^{-}$

O₂ > O $_{2}^{-}$

Greater the bond order, shorter is the bond length.

$∴ Bond order \propto \frac{1}{bond length}$

(i) Electronic configuration and bond order of C₂ and C $_{2}^{2 -}$ ions-

C₂ : KK σ2s², σ*2s², $π 2 p_{x}^{2}, π 2 p_{y}^{2}$

Bond order = $\frac{1}{2}$ (6 - 2) = 2

C $_{2}^{2 -}$ : KK σ2s², σ*2s², $π 2 p_{x}^{2}, π 2 p_{y}^{2}, σ 2 p_{z}^{2}$

Bond order = $\frac{1}{2}$ (8 - 2) = 3

$∴$ The order of bond length : C₂ > C $_{2}^{2 -}$

(ii) Electronic configuration and bond orders of B $_{2}^{+}$ and B₂-

B₂ : KK σ2s², σ*2s², $π 2 p_{x}^{1}, π 2 p_{y}^{1}$

Bond order = $\frac{1}{2}$ (4 - 2) = 1

B $_{2}^{+}$ : KK σ2s², σ*2s², $π 2 p_{x}^{1}$

Bond order = $\frac{1}{2}$ (3 - 2) = $\frac{1}{2}$

$∴$ The order of bond length : B $_{2}^{+}$ > B₂

(iii) Electronic configuration and bond order of Li₂ and Li $_{2}^{+}$

Li₂ : KK σ2s²

Bond order = $\frac{1}{2}$ ( 2 - 0) = 1

Li $_{2}^{+}$ : KK σ2s¹

Bond order = $\frac{1}{2}$ ( 1 - 0) = $\frac{1}{2}$

$∴$ The order of bond length : Li $_{2}^{+}$ > Li₂

(iv) Electronic configuration and bond order of O₂ and O $_{2}^{-}$

O₂ : KK σ2s², σ*2s², $σ 2 p_{z}^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, π * 2 p_{x}^{1}, π * 2 p_{y}^{1}$

Bond Order = $\frac{1}{2}$ ( 8 - 4) = 2

O $_{2}^{-}$ : KK σ2s², σ*2s², σ2p $_{z}^{2}$ , $π 2 p_{x}^{2}, π 2 p_{y}^{2}, π * 2 p_{x}^{2}, π * 2 p_{y}^{1}$

Bond order = $\frac{1}{2}$ ( 8 - 5) = 1.5

$∴$ The correct order of bond length = O $_{2}^{-}$ > O₂

Intramolecular hydrogen bond is present in

water
o-nitrophenol
p-nitrophenol
methylamine

A mixture of ethane and ethene occupies 41 L at 1 atm and 500 K. The mixture reacts completely with $\frac{10}{3}$ mole of O₂ to produce CO₂ and H₂O. The mole fraction of ethane and ethene in the mixture are respectively (R = 0.082 L atm K^-1 mol^-1)

0.50, 0.50
0.75, 0.25
0.67, 0.33
0.25, 0.75

Substance which is weakly repelled by a magnetic field is

O₂
H₂O
CrO₂
Fe₃O₄

The correct decreasing order of first ionisation enthalpies of five elements of the second period is

Be > B > C > N > F
N > F > C > B > Be
F > N > C > Be > B
N > F > B > C > Be

In the reaction H₂S+ H₂O₂ → S+ 2H₂O

H₂S is an acid and H₂O₂ is a base
H₂S is a base and H₂O₂ is an acid
H₂S is an oxidising agent and H₂O₂ is a reducing agent
H₂S is an reducing agent and H₂O₂ is a oxidising agent

The bonds present in the structure of dichromate ion are

four equivalent Cr-O bonds only
six equivalent Cr-O bonds and one Cr - O - O bond
six equivalent Cr-O bonds and one O-O bond
eight equivalent Cr-O bonds

10.

Molar heat capacity of aluminium is 25 JK^-1 mol^-1. The heat necessary to raise the temperature of 54 g of aluminium (atomic mass 27 g mol^-1) from 30°C to 50°C is