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Solution


Q.

Which of the following reaction(s) has a positive entropy change

I)  Ag+(aq)+Cl-(aq)→AgCl(s)

II)  NH4Cl(s)→NH3(g)+HCl(g)

III)  2NH3(g)→N2(g)+3H2(g)
1 I and II   
2 III only  
3 II & III   
4 II only  

Ans.

(3)

In (I), solid formed. In others more number of moles of gases are formed, ΔS=+ve