Assertion : $S i F_{6}^{2 -}$ is known but $S i C l_{6}^{2 -}$ is not known. Reason: Interaction of $F$ lone pair electrons with $S i$ is stronger than that of chlorine and due to smaller size of $F$ steric repulsion will be less.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
The size of fluorine is small therefore can be easily arranged around Silicon to form $S i F_{6}^{2 -}$ while the size of chlorine is large enough which create steric hindrance to each other therefore cannot be arranged around silicon in excess.

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Assertion :SiF2−6 is known but SiCl2−6 is not known. Reason: Interaction of F lone pair electrons with Si is stronger than that of chlorine and due to smaller size of F steric repulsion will be less.

Assertion : $S i F_{6}^{2 -}$ is known but $S i C l_{6}^{2 -}$ is not known. Reason: Interaction of $F$ lone pair electrons with $S i$ is stronger than that of chlorine and due to smaller size of $F$ steric repulsion will be less.