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B
5
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C
7
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D
3
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Solution
The correct option is A 6 Oxidation number of ′S′ in Marshall's acid (H2S2O8) is +6. The structure is: Here, two 'O' Atoms are present in peroxide linkage i.e. O. N. of oxygen = -1 Thus, 2(+1)+2x+2(−1)+6(−2)=0 Or x = +6