A) sulphate ion
B) sulphide ion
C) thiosulphate ion
D) sulphite ion
Correct Answer: C
Solution :
Sulphide and sulphite ions both react with dil. \[HCl,\] on warming their aqueous solutions giving \[{{H}_{2}}S\] and \[S{{O}_{2}}\] gases respectively but no yellow precipitate are formed. Sulphate ion does not react. The only ion left is thiosulphate, which gives \[S{{O}_{2}}\] gas with a pungent odour and pale yellow precipitate of colloidal sulphur \[{{S}_{2}}O_{3}^{2-}+2{{H}^{+}}\xrightarrow[{}]{\Delta }\underset{\begin{smallmatrix} (pungent \\ odour) \end{smallmatrix}}{\mathop{S{{O}_{2}}\uparrow }}\,+\underset{pale\,yellow}{\mathop{S\downarrow }}\,+{{H}_{2}}O\]
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