Question

Assertion (A): $[SiF_6]^{2-}$ is formed but $[SiCl_6]^{2-}$ is not
Reason (R): Electronegativity $(EN)$ of $F$ is higher than $EN$ of $Cl$

• A. Both (A) and (R) are conect and (R) is the collect explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is collect but (R) is not collect
• D. (A) is not collect but (R) is correct

Answer 1

Answer: (B)

$SiF _{6}^{2-}$ is formed but $SiCl _{6}^{2-}$ is not because $Cl$ has greater size than $F$. Therefore, larger size of anions cannot form complex with silicon. Electronegativity of $F$ is higher than $Cl$ but cannot explain about Assertion. Thus, Assertion and Reason both are correct but Reason (R) is not the correct explanation of (A).