`[X]+H_2SO_4 to [Y]` a colourless gas with irritating smell.
`[Y]+K_2Cr_2O_7+H_2SO_4 to `Green solution [X] and [Y] are :

Options

A. `SO_(3)^(2-)`, `SO_2`
B. `Cl^(-), HCl `
C. `S^(2-), H_2S`
D. `CO_3^(2-), CO_2 `

Answer

A

Explanation

`SO_3^(2-) + H_2SO_4 to underset("Burning smell of sulphur (irritating)")(SO_2 uarr + SO_4^(2-)) + H_2O`
`SO_2` turns `K_2Cr_2O_7` solution in acid medium green .