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For which among the following reactions, change in entropy is less than zero?A. Sublimation of IodineB. Dissociation of HydrogenC. Formation of HydrogenD. Thermal decomposition of Calcium Carbonate |
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Answer» Correct Answer - C The formation of water. `H_(2)(g) + O_(2)(g) to H_(2)O(l)` `DeltaS = sumS_("Products") -sum S_("reactants")` An Entropies of reactants are more than products Hence `DeltaS` is negtive. (a) For sublimation of Iodine `I_(2)(g) to 2I_(g) DeltaS = +ve` (b) Dissociation of hydrogen `H_(2)(g) to 2H(g)` `DeltaS=+ve` (d) Thermal decomposition of `CaCO_(3)` `CaCO_(3)(s) to CaO(s) + CO_(2)(g), DeltaS= +ve` |
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