1.

A substance on treatment with dil H_(2)SO_4 liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. The reaction indicates the presence of

Answer»

`CO_(3)^(2-)`
`S^(2-)`
`Mg^(2+)`
`NO_(2)^(-)`

SOLUTION :`Na_(2)SO_(3)+2HCl(dil.)to2NaCl+H_(2)O+SO_(2),K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+3SO_(4)^(2-)toK_(2)SO_(4)+underset((green))(Cr_(2)(SO_(4))_(3))+H_(2)O`


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