question_answer

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction? [AIPMT (S) 2005]

A)  Exothermic and decreasing disorder

B)       Endothermic and increasing disorder

C)       Exothermic and increasing disorder          

D)       Endothermic and decreasing disorder

Correct Answer: B

Solution :

If reaction is exothermic, therefore,  is -ve and on increasing disorder,  is +ve thus, at these condition,  is negative according to following equation.

. Hence, for spontaneous reaction  must be .