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  4. Which oxyacid of sulphur contains S-S single bond ?

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Q. Which oxyacid of sulphur contains $S-S$ single bond ?

MHT CETMHT CET 2014

Solution:

(a) Oleum $\left( H _{2} S _{2} O _{7}\right)$
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(b) Marshall's acid $\left( H _{2} S _{2} O _{8}\right)$
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(c) Dithionic acid $\left( H _{2} S _{2} O _{6}\right)$
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(d) Thiosulphuric acid $\left( H _{2} S _{2} O _{3}\right)$
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Thus, in dithionic acid, $S - S$ single bond is present.