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Question

The correct sequence of increasing covalent character is represented by


A

LiCl < NaCl < BeCl2

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B

BeCl2 < LiCl < NaCl

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C

NaCl < LiCl < BeCl2

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D

BeCl2 < NaCl < LiCl

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Solution

The correct option is C

NaCl < LiCl < BeCl2


For all the compounds, the anion is the same - chloride. The higher the charge density of the cation, the greater its polarizing power. Be2+ has twice the charge of Li+ and yet a smaller radius. By far, BeCl2 is the most covalent of the given. Li+ has higher charge density and thus greater polarizing power than Na+. Hence the order is:

NaCl < LiCl < BeCl2


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