Consider the following sulphur-based oxoacids | vedclass

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(A) To determine the number of oxoacids with a peroxo $(O-O)$ bond,we examine their structures:$1$. $H_2SO_3$ (Sulphurous acid): Contains only $S=O$ a

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$1$

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(A) To determine the number of oxoacids with a peroxo $(O-O)$ bond,we examine their structures:$1$. $H_2SO_3$ (Sulphurous acid): Contains only $S=O$ and $S-OH$ bonds. No peroxo bond.$2$. $H_2SO_4$ (Sulphuric acid): Contains $S=O$ and $S-OH$ bonds. No peroxo bond.$3$. $H_2S_2O_8$ (Peroxodisulphuric acid): Contains a central $O-O$ peroxo linkage between two sulphur atoms.$4$. $H_2S_2O_7$ (Pyrosulphuric acid): Contains an $S-O-S$ linkage. No peroxo bond.Thus,only $H_2S_2O_8$ contains a peroxo bond.The total count is $1$.

List-$I$ (Oxoacids of Sulphur)	List-$II$ (Bonds)
$A$. Peroxodisulphuric acid	$I$. Two $S-OH$,Four $S=O$,One $S-O-S$
$B$. Sulphuric acid	$II$. Two $S-OH$,One $S=O$
$C$. Pyrosulphuric acid	$III$. Two $S-OH$,Four $S=O$,One $S-O-O-S$
$D$. Sulphurous acid	$IV$. Two $S-OH$,Two $S=O$

Consider the following sulphur-based oxoacids: $H_2SO_3$,$H_2SO_4$,$H_2S_2O_8$,and $H_2S_2O_7$. Among these oxoacids,the number of those with a peroxo $(O-O)$ bond is $..........$

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