Q5 / 160 · AP EAMCET 2022 (05 Jul Shift 2) · Chemistry

The combination of which of the following gives an ionic compound with maximum covalent character.

A
$\mathrm{Mg}^{2+}$ and $\mathrm{Cl}^{-}$
Correct answer
B
$\mathrm{Mg}^{2+}$ and $\mathrm{O}^{2-}$
C
$\mathrm{Na}^{+}$and $\mathrm{Br}^{-1}$
D
$\mathrm{Na}^{+}$and $\mathrm{O}^{2-}$

Solution

According to the Fajan's rule, smaller the size of cation and larger size anion have greater covalent character.

Hence, the correct answer is option: 'B'.

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