Formula of Di Sulphurous acid is

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H₂S₂O₆

H₂S₂O₅

H₂S₂O₇

H₂S₂O₈

answer is C.

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Detailed Solution

All oxo acids of Sulphur are dibasic ;

In all oxo acids, Sulphur atom is sp³ hybridized ;

All the pi bonds are $dπ - pπ$ bonds;

Sulphur atom having 2 sigma bonds, 1 double bond and a lone pair around it has pyramidal arrangement around it ;

Sulphur atom having 2 sigma bonds, 1 double bond and a lone pair around will be tetravalent with +4 O.S (or) +3 O.S;

Sulphur atom having 2 sigma bonds, 2 double bond and no lone pairs around it has tetrahedral arrangement around it ;

Sulphur atom having 2 sigma bonds, 2 double bond and no lone pair around will be hexavalent with +6 O.S (or) +5 O.S;

Note : Do not forget to count a sigma bond between Oxygen and Hydrogen in O-H bond ;

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