' O - O ' peroxy bond is present in :-

1. ${\mathrm{H}}_2{\mathrm{SO}}_5$
2. ${\mathrm{HNO}}_4$
3. ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
4. All of these

Solution

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Asked in: JEE-TOPICTESTS-CHEMISTRY

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