First slide
Fundamentals of thermodynamics

In which reaction there will be increase in entropy


In reaction (a) Na (s) reacts with H2O(l)  to give NaOH(l) and 12H2(g)

Since, the entropy of a gas is higher than  that of liquid and the entropy of liquid is higher than 
that of solid, therefore, the change in entropy of this reaction increases. 

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