Question

$SiF_6^{2-}$ is known but $SiCl_6^{2-}$ is not. Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of $Si$ strongly.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

If both assertion and reason are true and reason is the correct explanation of assertion

Answer 2

Both assertion and reason are true and reason is the correct explanation of assertion. $SiF _{6}^{2-}$ is known, as $F$ has small size and thus, the ion is quite stable unlike $SiCl _{6}^{2-}$ in which size of $Cl$ atom is large which destabilise it.