1.

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

Answer»

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

Solution :If reaction is exothermic, then, `DeltaH` is -ve and on increasing disorder `DeltaS` is +ve THUS, at these condiition, `DeltaG` is negative according to follow equation.
`DeltaG=DeltaH-TDeltaS`
`DeltaG=-ve`. HENCE, for spontaneous reaction, `DeltaG` MUST be -ve.


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