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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

2.
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

n = 2 to n = 1

According to Rydberg;s formula,

$\frac{1}{λ} = R (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}}) Z^{2}$

For He⁺ ion; Z = 2; n₁ = 2 and n₂ = 4

$∴ \frac{1}{λ} = R (\frac{1}{2^{2}} - \frac{1}{4^{2}}) \times 2^{2} = R \times \frac{3}{16} \times 4 \frac{1}{λ} = \frac{3 R}{4} or, λ = \frac{4}{3 R}$

For getting the same value of wavelength in hydrogen atomic spectrum, the values of n₁ and n₂ must be 1 and 2 respectively.

$∴ \frac{1}{λ} = R (\frac{1}{1^{2}} - \frac{1}{2^{2}}) \times 1 \frac{1}{λ} = \frac{3 R}{4} λ = \frac{4}{3 R}$

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 $_{2}^{-}$

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