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Question

Assertion :All the S atoms in S4O26 have oxidation number equal to +2.5. Reason: Average oxidation number of sulphur in S4O26 is +2.5.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is D Assertion is incorrect but Reason is correct
Let x be the oxidation number of S in S4O26 .
The oxidation number of oxygen is 2. The sum of the oxidation numbers is equal to the charge i.e. 2.
4x+6(2)=2 or, x=2.5.
Thus, the average oxidation number of sulfur is 2.5.
Out of four S atoms, two S atoms are linked to other S atoms only.
These two S atoms have an oxidation number of 0.
The other two sulphur atoms are linked to O and S atoms. They have oxidation number of +5 each.
The structure is given below:
107139_18361_ans.png

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