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Which of the following oxoacid of sulphur has $-O-O-$ linkage?
A
$H_2SO_4$, sulphuric acid
B
$H_2S_2O_8$, peroxodisulphuric acid
C
$H_2S_2O_7$, pyrosulphuric acid
D
$H_2SO_3$, sulphurous acid
