The oxidation number(s) of sulphur in pyrosulphurous acid $\left(\mathrm{H}_{2} \mathrm{~S}_{2}…

The oxidation number(s) of sulphur in pyrosulphurous acid $\left(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{5}ight)$ is/are
  1. $+6,+6$
  2. $+5,+5$
  3. $+5,+3$
  4. $+4,+2$

Solution

The structure of $\mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{5}$ is

.
The oxidation number of sulphur atoms are $+5$ and $+3$, respectively.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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