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For two ionic solids CaO and KI, identify the wrong statement amongst the following:

1. The lattice energy of CaO is much large than that of KI
2. KI is more soluble in water
3. KI has higher melting point
4. CaO has higher melting point

Correct answer: KI has higher melting point

Solution

The melting point of CaO is higher than that of KI due to stronger ionic bonds in CaO, as it involves divalent ions (Ca²⁺ and O²⁻) compared to monovalent ions (K⁺ and I⁻) in KI. Thus, option C is incorrect.

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