(A) The chemical formula for peroxodisulphuric acid (also known as Marshall's acid) is $H_2S_2O_8$.In its structure,two $SO_3$ groups are linked by a

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(A) The chemical formula for peroxodisulphuric acid (also known as Marshall's acid) is $H_2S_2O_8$.In its structure,two $SO_3$ groups are linked by a peroxide linkage,which is an $O-O$ single bond.The structure is $HO-SO_2-O-O-SO_2-OH$.Therefore,it contains an $O-O$ bond.