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Q.

The stability of dihalides of $S i, G e, S n a n d P b$ increases steadily in the sequence

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a

$P b x_{2} < < S n X_{2} < < G e X_{2} < < S i X_{2}$

b

$S i X_{2} < < G e X_{2} < < P b x_{2} < < S n X_{2}$

c

$S i X_{2} < < G e X_{2} < < S n X_{2} < < P b x_{2}$

d

$G e X_{2} < < S i X_{2} < < S n X_{2} < < P b x_{2}$

answer is D.

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Detailed Solution

Reluctance of valence shell electrons to participate in bonding is called inert pair effect. The stability of lower oxidations state (+2 for group 14 elecments) increases on going down the group. So the correct order is $S i X_{2} < < G e X_{2} < < S n X_{2} < < P b x_{2}$

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