Assertion (A): \( \left[\mathrm{SiF}_{6}\right]^{2-} \) is known but \( \left[\mathrm{SiCl}_{6}\...

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Assertion (A): \( \left[\mathrm{SiF}_{6}\right]^{2-} \) is known but \( \left[\mathrm{SiCl}_{6}\right]^{2-} \) not.
Reason (R): Size of fluorine is small and its lone pair of electrons interact with \( d \)-orbitals of Si strongly.
(A) Both A and R are true and R is the correct explanation of A.br(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(E) Both A and R are false.
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