JEE Main Chemistry question

Acidified solution of sodium thiosulphate is unstable because in thiosulphate:

(A)The sulphur atoms are at unstable oxidation state of
(B)The two sulphur atoms are in different oxidation states of and Correct
(C)The S–S bond are unstable bonds
(D)Thio compounds contain sulphur in zero oxidation state

Answer: (B)

Solution

In the thiosulphate ion, , the two sulphur atoms are not equivalent — one (the central, "sulphate-like" S) is in the oxidation state, while the other (the terminal, "sulphide-like" S) is in the oxidation state; this mismatched pair readily disproportionates in acid to give elemental sulphur and

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Question ID VK-137833