1.

[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 :

Answer»

`SO_(3)^(2-)`, `SO_2`
`Cl^(-), HCl `
`S^(2-), H_2S`
`CO_3^(2-), CO_2 `

Solution :`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 .


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