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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

JEE Main levelSingle correct optionDifficulty 2 of 3pn151

Which oxyacid of sulphur has an S-S bond and sulphur in the +5 oxidation state?

A $H X_{2} S X_{2} O X_{8}$
B $H X_{2} S X_{2} O X_{7}$
C $H X_{2} S X_{2} O X_{3}$
D $H X_{2} S X_{2} O X_{6}$

Answer: D

Dithionic acid has the structure

(HO) O X_{2} S - SO X_{2} (OH)

, each S bearing three bonds to oxygen (+5 each) and an S-S bond. H2S2O7 and H2S2O8 have S(+6) with no S-S bond; H2S2O3 has S-S but S(+6) and S(

- 2

).

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