1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: SiF62- is known but SiCl62- is not. Reason: Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of Si strongly.

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

AIIMSAIIMS 2005The p-Block Elements

Solution:

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.