Answer:
(i) When a liquid crystallizes into a
solid, its entropy decreases because degree of randomness is less in a solid as
compared to that in a liquid.\[\left( \Delta \text{S }=\text{ }-\text{ }ve
\right)\].
(ii) When a
crystalline solid is heated from 0 K to 115 K, its entropy increases \[(\Delta
S=+ve)\] because at higher temperature, the constituent units start vibration
around their mean position.
(iii) In the
reaction,
\[2NaHC{{O}_{3}}(s)\to
N{{a}_{2}}C{{O}_{3}}(s)+C{{O}_{2}}(g)+{{H}_{2}}O(g)\]
the number
of gaseous components are increasing hence the entropy of system will increase.
(iv)\[{{H}_{2}}(g)\to
2H(g)\]
In above decomposition, number of particles increase therefore,
the randomness and entropy will also increase.
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