Which of the following oxyacids of sulphur co | vedclass

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(A) To identify the oxyacid with an $S-S$ linkage,let us examine the structures:$1$. $H_{2}SO_{3}$ (Sulphurous acid): Structure is $(HO)_{2}S=O$. No $

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$H_{2}S_{2}O_{4}$

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(A) To identify the oxyacid with an $S-S$ linkage,let us examine the structures:$1$. $H_{2}SO_{3}$ (Sulphurous acid): Structure is $(HO)_{2}S=O$. No $S-S$ bond.$2$. $H_{2}S_{2}O_{4}$ (Dithionous acid): Structure is $(HO)S(=O)-S(=O)(OH)$. This contains an $S-S$ linkage.$3$. $H_{2}S_{2}O_{5}$ (Disulphurous acid): Structure is $(HO)S(=O)-O-S(=O)_{2}(OH)$. This contains an $S-O-S$ linkage.$4$. $H_{2}S_{2}O_{2}$ (Thiosulphurous acid): Structure is $H-S(=O)-S-H$. This contains an $S-S$ linkage,but $H_{2}S_{2}O_{4}$ is the standard oxyacid commonly cited for this property in textbooks.Therefore,$H_{2}S_{2}O_{4}$ is the correct answer.

Which of the following oxyacids of sulphur contains an $S-S$ linkage?

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