Question

The gas librated , on heating a mixture of two salts with `NaOH` give sa reddish brown precipitate with an alkline solution of `K_(2)HgI_(4)` the aqeous solution of the mixture on treatment with `BaCI_(2)` gives awhite precipitate which is sparingly soluble with `K_(2)Cr_(2)O_(7)` and concentrated `H_(2)SO_(4)`red vapour of A are produced .The aqueous solution of the mixture gives a deep -blue colouration B with potassium ferrcyanide soluble identify the redicals in the gives mixture and write the balanced equation in the gives mixture and write the balanced equations for the formation of A and B

Answer 1

The mixture contain
`NH_(4)^(Theta) , CI^(Theta) ,SO_(4)^(Theta) ,Fe^*(2+)`
i. Gas is clearly ammonia` rArr NH_(4)^(Theta)` is confiemed
iiiWhite ppt `overset(HCI)` to sparingly soluble
`rArr SO_(4)^(2-)` ion is present
iii Red vapour are produced
`K_(2)Cr_(2)O_(3) + H_(2)SO_(4) + ? rarr ` REd vapour
`(rArr Cr_(2)CI_(2)`chromyl chloride)
Hence `CI^(Theta)` ion is present
iv Test indicates `Fe^(2+)`
`Fe^(2+) + [Fe(CN)_(6)]^(2+) rarr Fe^(3+) + underset("Deep blue")(Fe_(4)[Fe(CN)_(6)]_(3))`