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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The structure of $S_{4} {O_{6}}^{2 -}$ is shown in the figure.
The oxidation state of two of the middle Sulphur atom is 0 due to no electronegativity difference. The remaining two sulphur atoms have +5 oxidation state for each. Therefore the assertion is correct.
The Average oxidation state $= \frac{2 \times (+ 5) + 2 \times (0)}{4} = 2.5$ . Thus the reason iven is correct. But the reason is not the correct explanation for assertion.

Hence, the correct option is B.

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