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Q.

The covalent alkaline earth metal halide

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a

$C a X_{2}$

b

$S r X_{2}$

c

$B e X_{2}$

d

$M g X_{2}$

answer is C.

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Detailed Solution

By Fajan’s rule
Covalent character $\propto$ polarization
$\propto \frac{1}{s i z e o f c a t i o n}$
Covalent nature : $B e X_{2} > M g X_{2} < C a X_{2} > S r X_{2}$

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