1.

ZnXoverset("dil."H_(2)SO_(4))(rarr)underset("Colourless gas")(A)+BA overset(K_(2)Cr_(2)O_(7))(rarr)Y (Yellow turnbidity) + Green Solution. Then X is

Answer»

`NO_(2)^(-)`
`S_(2)O_(3)^(2-)`
`SO_(3)^(2-)`
`S^(2-)`

Solution :`ZnSoverset("DIL" H_(2)SO_(4))(rarr)underset((B))(ZnSO_(4))+`
`underset((A))(H_(2)S)OVERSET(K_(2)Cr_(2)O_(7))(rarr)Sdarr+Cr^(3+)`


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