A) \[{{H}_{2}}(g)+{{I}_{2}}(g)\rightleftharpoons 2HI(g)\]
B) \[HCl(g)+N{{H}_{3}}(g)\rightleftharpoons N{{H}_{4}}Cl(s)\]
C) \[N{{H}_{4}}N{{O}_{3}}(s)\rightleftharpoons {{N}_{2}}O(g)+2{{H}_{2}}O(g)\]
D) \[MgO(s)+{{H}_{2}}(g)\rightleftharpoons Mg(s)+2{{H}_{2}}O(l)\]
Correct Answer: C
Solution :
Entropy is a measure of randomness of the system, so entropy of a substance in different physical states is in the order Gas > liquid > solid \[\Delta S={{S}_{\text{Prodct}}}-{{S}_{\text{Reactant}}}\] In option solid is converted into gaseous state, so \[\Delta S\]will be positive.
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