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(C) Analysis of options:$A$: The structure of $HSO_5^-$ (peroxymonosulphate) is $HO-O-SO_2-O^-$. It contains an $S-O-O-H$ linkage,not an $S-O-H$ linka

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Hybridization of both sulphur atoms in $H_2S_2O_5$ (pyrosulphurous acid) is the same,but the oxidation states of both sulphur atoms are different.

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(C) Analysis of options:$A$: The structure of $HSO_5^-$ (peroxymonosulphate) is $HO-O-SO_2-O^-$. It contains an $S-O-O-H$ linkage,not an $S-O-H$ linkage.$B$: Borax $(Na_2[B_4O_5(OH)_4] \cdot 8H_2O)$ has $5$ $B-O-B$ linkages,while $P_4O_{10}$ has $6$ $P-O-P$ linkages. They are not equal.$C$: In pyrosulphurous acid $(H_2S_2O_5)$,one sulphur atom is $sp^3$ hybridized with an oxidation state of $+3$,and the other is $sp^3$ hybridized with an oxidation state of $+5$. Thus,the hybridization is the same,but the oxidation states are different. This is correct.$D$: Tetra-polyphosphoric acid $(H_6P_4O_{13})$ has a chain structure with $3$ $P-O-P$ linkages,not $4$.

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