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NEET levelSingle correct optionDifficulty 1 of 3cb167

According to Fajans' rules, covalent character in an ionic compound is favoured by

Aa large cation and a small anion
Ba large cation and a large anion
Ca small cation and a small anion
Da small cation and a large anion

Answer: D

A small cation has high polarising power and a large anion is easily polarised. Both effects together distort the anion's electron cloud toward the cation and increase covalent character. So a small cation with a large anion is correct.

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