1.

For which among the following reactions, change in entropy is less than zero?

Answer»

SUBLIMATION of Iodine
Dissociation of Hydrogen
Formation of Hydrogen
Thermal decomposition of Calcium Carbonate

SOLUTION :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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