Question

Assertion: $Si{F}_6^{2-}$ is known but $SiC{l}_6^{2-}$ is not
Reason: 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 the reason is a correct explanation of the assertion
• B. If both assertion and reason are true but reason is not a correct explanation of the assertion
• C. If the assertion is true but reason is false
• D. If both the assertion and reason are false
• E. If the assertion is false but the reason is true

Answer 1

The correct option is A If both assertion and reason are true and the reason is a correct explanation of the assertion

Option (A) is correct.

$Si{F}_6^{2-}$ is known because $F$ has small size therefore can be easily arranged around silicon to form $Si{F}_6^{2-}$ and thus the ion is quite stable unlike $SiC{l}_6^{2-}$ in which size of $Cl$ atom is large which destabilize it and create steric hindrance to each other therefore cannot be arranged around silicon in excess.