Question

Find the number of acid(s) which are having peroxy linkage from the following:
$H_{3}P{O}_5,H_{2}S{O}_5,H_2{S}_2{O}_7,H_2{S}_2{O}_8,HCl{O}_4$

Answer 1

Three acids have peroxy linkage.
$H_{3}P{O}_5$: Peroxomonophosphoric acid, $\left(OP\right(OH{)}_2\left(OOH\right))$, a tribasic acid containing a peroxide group.

$H_{2}S{O}_5$: Peroxomonosulphuric acid contains an O-O linkage.

$H_2{S}_2{O}_7$: Pyrosulphuric acid does not contain an O-O linkage.

$H_2{S}_2{O}_8$: Peroxodisulphuric acid contains an O-O linkage.

$HCl{O}_4$: Perchloric acid does not contain an O-O linkage.