The sBlock Elements - Result Question 31
####37. For two ionic solids $CaO$ and $KI$, identify the wrong statement amongst the following : [1997]
(a) The lattice energy of $CaO$ is much large than that of KI
(b) $KI$ is more soluble in water
(c) KI has higher melting point
(d) $CaO$ has higher melting point
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Solution:
- (c) $CaO$ has higher lattice energy because of higher charge on $Ca^{2+}$ and $O^{2-}$, which results in higher attraction. $KI$ is more soluble in water because of low lattice energy and higher hydration energy. Clearly (c) is wrong because $CaO$ has higher melting point as compared to KI.
