Assertion :The oxidation state of $S$ in $H_{2} S_{2} O_{8}$ is $6$ . Reason: Maximum oxidation state of $S$ is $6$ because the maximum oxidation state of an element is its number of valence electron.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The electronic configuration of $S$ is $1 s^{2} 2 s^{2} p^{6} 3 s^{2} 3 p^{4}$ .
So, $6$ valence electrons are present. Therefore, maximum oxidation state can be $+ 6$ .
And, oxidation state of $S$ in $H_{2} S_{2} O_{8}$ is $+ 6$ .
The structure is given below:

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