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Question

Which one of the following has $$\Delta S^o$$ 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 $$CaO_{(s)}+CO_{2(g)}\rightleftharpoons CaCO_{3(s)}$$
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, $$ NaNO_{3} $$ changes from solid to its aqueous ions $$ Na^{+} $$ and $$ NO_{3}^{-} $$. Thus, entropy is greater than zero. 

Chemistry

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