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  • For two ionic solids and <img alt="\mathrm{KI}" src="https://entrancecorner.oncodecogs.com/gif.la

For two ionic solids \mathrm{CaO} and \mathrm{KI}, identify the wrong statement among the following:

Option: 1

Lattice energy of \mathrm{CaO} is much higher than that of \mathrm{KI}.


Option: 2

\mathrm{KI} is insoluble in benzene.


Option: 3

\mathrm{CaO} is sparingly soluble in water.


Option: 4

\mathrm{KI} has high melting point.


Answers (1)

best_answer

\mathrm{CaO} has high lattice energy in comparison to KI due to more charge to size ratio. Calcium ion is not only smaller than Potassium ion but also has twice the charge as that of Potassium ion. Similarly, Oxide ion also has a smaller size as compared to the Iodide ion and even higher charge (magnitude wise). Hence, the lattice energy of \mathrm{CaO} is higher than \mathrm{KI}.

Due to lower lattice energy of \mathrm{KI} as compared to that of \mathrm{CaO}, the melting point of \mathrm{KI} is much lower than that of \mathrm{CaO}.

 

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Gaurav

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