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Question

Which one of the following has ΔSo greater than zero?

A
CaO(s)+CO2(g)CaCO3(s)
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B
NaCl(aq)NaCl(s)
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C
NaNO3(s)Na+(aq)+NO3(aq)
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D
N2(g)+3H2(g)2NH3(g)
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Solution

The correct option is A CaO(s)+CO2(g)CaCO3(s)
Entropy is positive(greater than zero) when a system moves from a less random state to a more random state. Thus, as there is a change from solid to liquid to gas, entropy keeps on increasing and become greater than zero.
In the reaction given in C option, NaNO3 changes from solid to its aqueous ions Na+ and NO3. Thus, entropy is greater than zero.

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