Consider the following sulphure based oxoacids. $\mathrm{H}_{2} \mathrm{SO}_{3}, \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}$ and $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$. Amongst these oxoacids, the number of those with peroxo(O-O) bond is \_\_\_\_.

JEE Main · 2022 · 29 Jul 2022 · Shift 2 · p-Block Elements

Consider the following sulphure based oxoacids.

H_{2} SO_{3}, H_{2} SO_{4}, H_{2} S_{2} O_{8}

and

H_{2} S_{2} O_{7}

.
Amongst these oxoacids, the number of those with peroxo(O-O) bond is ____.

Answer: 1

Solution

A peroxo bond is an O–O single bond in the structure of an oxoacid.

Examining each acid:

** $H_{2} SO_{3}$ ** (sulfurous acid): No O–O bond.
** $H_{2} SO_{4}$ ** (sulfuric acid): No O–O bond.
** $H_{2} S_{2} O_{8}$ ** (peroxodisulfuric acid or Marshall's acid): Contains a peroxo O–O bond linking two $SO_{3}$ groups.
** $H_{2} S_{2} O_{7}$ ** (pyrosulfuric acid): No O–O bond; it has an S–O–S bridge.

Only one oxoacid (

H_{2} S_{2} O_{8}

) contains a peroxo bond.

The answer is 1.

JEE Main · 2022 · 29 Jul 2022 · Shift 2 · Integer answer

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