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Q.

Which of the following can exist ?

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a

[SiF6]2-

b

[SiCl6]2-

c

[CF6]2-

d

All of these

answer is A.

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Detailed Solution

[CF6]2- — cannot exist ---- non availability of vacant d-orbitals in carbon.[SiCl6]2- — cannot exist ---- small Si4+ cannot accomodate six large Cl- ions.

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Which of the following can exist ?