Question

# Which one of the following has $$\Delta S^o$$ greater than zero?

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

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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