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JEE Chemistry Solved Question Paper 2007

Multiple Choice Questions

21.

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

Endothermic and decreasing disorder
Exothermic and increasing disorder
Endothermic and increasing disorder
Exothermic and decreasing disorder

22.

Identify the correct statement for change of Gibbs energy for a system ( $∆$ G_system) at constant temperature and pressure

If $∆$ G_system = 0, the system has attained equilibrium
If $∆$ G_system = 0, the system is still moving in a particular direction
If $∆$ G_system = 0, the process is not spontaneous
If $∆$ G_system = 0, the process is spontaneous

23.

The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be

2.0 × 10¹¹
4.0 × 10¹²
1.0 × 10²
1.0 × 10¹⁰

24.

_nX^memit one α and two β- particles. It is converted into

_nX^m^{- 4}
_n_{- 1}X^m^{- 1}
_nZ^m^{- 4}
None of these

25.

18 carat gold contains

18% gold
24% gold
75% gold
60% gold

26.

Which of the following metals will not form an amalgam?

Gold
Silver
Zinc
Iron

27.

The element which liberates oxygen gas from water is

28.
Which is the weakest acid out out of HF, HCl, HBr and HI?

HF

HCl

HBr

HI

The strength of an acid depends upon its degree of ionisation which in turn, depends upon the bond energy thus, higher the bond dissociation energy lower is the degree of ionisation and hence, weaker is the acid. Bond dissociation energies of the halogen acids increases in the order

HI < HBr < HCl < HF

Therefore, strength of the acid increases in the order-

HF < HCl < HBr < HI