1.

Passage - I : X+H_(2)SO_(4) to Y, a colourless gas with irritating smell. y+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to green solution. What is X?

Answer»

`SO_(3)`
`SO_(3)^(2-)`
`SO_(2)`
`OF_(2)`

Solution :`underset((X))(Na_(2)SO_(3))+2HCl to 2NaCl +H_(2)O +underset((y))(SO_(2)), K_(2)Cr_(2)O_(7)+3SO_(2)+H_(2)SO_(4) to K_(2)SO_(4)+underset("Green")(Cr_(2)(SO_(4))_(3))+H_(2)O`


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