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  4. In which of the following acids oxidation state of sulphur is different from that of the others ?

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Q. In which of the following acids oxidation state of sulphur is different from that of the others ?

Redox Reactions

Solution:

In sulphurous acid $(H_2SO_3)$, the O.N. of S is $2 \times (+ 1) + x + 3 \times (\sim \, 2) = 0$ or $x = + 6-2 = + 4$ .In other adds, the O.N. of $S$ is $+ 6$.