`[X] + H_(2)SO_(4) rarr [Y]`, a colourless gas with irritating smell and
`[Y ] + K_(2) Cr_(2)O_(7) +H_(2)SO_(4) rarr` Green solution [X] and[Y ] are, respectively -

Options

A. `SO_(3)^(2-),SO_(2)`
B. `CI^(Theta),HCI`
C. `S^(2-),H_(2)S`
D. `CO_(3)^(2-),CO_(2)`

Answer

a

Explanation

`[X]+ H_(2)SO_(4) rarr [Y]` colourless gas with irritating smell `[Y] + H_(2)SO_(4) rarr `Green solution
Sulphite ions give sulphide dioxide gas with sulpharic acid which turn acidified potassium dichromate to green
`SO_(3)^(2-) + H_(2)SO_(4) rarr SO_(2) + H_(2)O + SO_(4)^(2-)`
`3SO_(2) + K_(2)Cr_(2)O_(7) + H_(2)SO_(4) rarr K_(2)SO_(4) + underset(Green)((Cr_(2)(SO_(4))_(3))) + H_(2)O`