Question

Assertion : In the species, $S_{4}O_{6}^{2-}$ each of the two extreme sulphurs exhibits oxidation state of $+5$ and the two middle sulphurs as zero.
Reason : The average of four oxidation numbers of sulphurs of the $S_{4}O_{6}^{2-}$ is $2.5$.

• 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: (B)

The structure of $S_{4}O_{6}^{2-}$ is

Structural parameters reveal that the element for whom fractional oxidation state is realised, is present in different oxidation states and different oxidation states are due to different bonding situations.