| \[[X]+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}[Y]\] a colourless gas with irritating smell, |
| \[[Y]+{{K}_{2}}C{{r}_{2}}O+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}\] green solution. |
| [X] and [Y] is: |
A) \[S{{O}_{3}}^{2-},S{{O}_{2}}\]
B) \[C{{l}^{-}},HCl\]
C) \[{{S}^{2-}},{{H}_{2}}S\]
D) \[C{{O}_{3}}^{2-},C{{O}_{2}}\]
Correct Answer: A
Solution :
[a] \[S{{O}_{2}}\] and \[{{H}_{2}}S\] both being reducing agents, can turn acidified dichromate solution green. \[S{{O}_{2}}\] can be obtained by the action of acid upon sulphite while \[{{H}_{2}}S\] is evolved by the action of acid upon sulphide. However, \[S{{O}_{2}}\] has a burning sulphur smell which is irritating. \[{{H}_{2}}S\] has rotten egg like smell.
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