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JEE Chemistry Solved Question Paper 2014

Multiple Choice Questions

11.

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is

I >II > III
II > I > III
III > II > I
I > III > II

12.

An atomic nucleus having low n/p ratio tries to find stability by

the emission of an $α$ -particle
the emission of a positron
capturing an orbital electron (K-electron capture)
emission of a $β$ -particle

13.

$({}_{32}G^{76}, {}_{34}{Se}^{76}) and ({}_{14}{Si}^{30}, {}_{16}S^{32})$ are example of

isotopes and isobars
isobars and isotones
isotones and isotopes
isobars and isotopes

14.

₉₈Cf²⁴⁶ was formed along with a neutron when an unknown radioactive substance was bombarded with₆C¹². The unknown substance was

₉₁Pa²³⁴
₉₀Th²³⁴
₉₂U²³⁵
₉₂U²³⁸

15.

The values of $∆$ H and $∆$ S of a certain reaction are -400 kJ mol^-1 and -20 kJ mol^-1K^-1 respectively. The temperature below which the reaction is spontaneous, is

100 K
20 $°$ C
20 K
120 $°$ C

16.

The correct statement regarding the following energy diagrams is

Reaction M is faster and less exothermic than reaction N
Reaction M is slower and less exothermic than reaction N
Reaction M is faster and more exothermic than reaction N
Reaction M is slower and more exothermic than reaction N

17.

Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly

18.

The enthalpy of vaporisation of a certain liquid at its boiling point of 35°C is 24.64 kJ mol^-1. The value of change in entropy for the process is

704 JK ^-1mol^-1
80 JK^-1mol^-1
24.64 JK ^-1mol^-1
7.04 JK^-1mol^-1

19.
Given that
$C + O_{2} \to {CO}_{2}; ∆ H ° = - x kJ 2 CO + O_{2} \to 2 {CO}_{2}; ∆ H ° = - y kJ$
The heat of formation of carbon monoxide will be

$\frac{y - 2 x}{2}$

y + 2x

2x - y

$\frac{2 x - y}{2}$

$\frac{y - 2 x}{2}$

$Given, C + O_{2} \to {CO}_{2}; ∆ H ° = - x kJ . . . . . . . . . . . . (i) 2 {CO}_{2} + O_{2} \to 2 {CO}_{2}; ∆ H = - y kJ . . . . . . . (ii) required equation is C + \frac{1}{2} O_{2} \to CO ∆ H_{1}^{°} = ? On reversing eq . (ii), we get 2 {CO}_{2} \to 2 CO + O_{2}; ∆ H_{2}^{°} = + y kJ . . . . . (iii) Dividing eq . (iii) by 2 gives {CO}_{2} \to CO + \frac{1}{2} O_{2}; ∆ H_{3}^{°} = + \frac{Y}{2} kJ . . . . . . . (iv) On adding eq . (i) and (iv), we get (required equation) C + \frac{1}{2} O_{2} \to CO ∆ H_{1}^{°} = ∆ H ° + ∆ H_{3}^{°} = (- x + \frac{y}{2}) kJ = \frac{y - 2 x}{2} kJ$

20.

In case of heteronuclear diatomics of the type AB, where A is more electronegative than B, bonding molecular orbital resembles the character of A more than that of B. The statement