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Q.

Which one of the following species can exist

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a

SnCl6-2

b

BF6-3

c

SiCl6-2

d

CF6-2

answer is A.

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Detailed Solution

Boron and carbon cannot expand their octet; SiCl6-2 cannot exist because small Si+4 cannot accomodate six large Cl- ions around it. The bond is weak;. ∴only SnCl6-2 can exist

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