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(i) An aqueous solution of a compound (A...

(i) An aqueous solution of a compound (A) is acidic towards litmus and (A) sublimes at about `300^(@)C`.
(ii) (A) on treatment with an excess of `NH_(4)SCN` gives a red coloured compound (B) and on treatment with a solution of `K_(4)[Fe(CN)_(6)]` gives a blue coloured compound (C).
(iii) (A) on heating with excess of `K_(2)Cr_(2)O_(7)` in the presence of concentrated `H_(2)SO_(4)` evolves deep red vapours of (D).
(iv) On passing the vapour of (D) into a solution of NaOH and then adding the solution of acetic acid and lead acetate, a yellow precipitate of compound (E) is obtained.
Identify (A) to (E) and give chemical equations for the reactions.

Text Solution

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`FeCl_(3)` solution is acidic and the solid sublimes at `300^(@)C`. Its solution reacts with `NH_(4)SCN` to give red coloured ferric thiocyanate and react with `K_(4)Fe(CN)_(6)` to form a blue coloured complex, ferric ferrocyanide
`underset((A))(FeCl_(3)) + underset( "Ammonium thiocyanate")(3NH_(4)SCN) rarr underset("Ferric thiocyanate ( Red)") underset((B))(Fe(SCN)_(3))+ 3NH_(4)Cl`
`4FeCl_(3)+ 3K_(4)[Fe(CN)_(6)] rarr underset("Ferric ferrocyanide (Blue)") underset((C )) (Fe_(4)[Fe(CN)_(6)]_(3))= 12 KCl`
`underset((A)) (2FeCl_(3))+ K_(2)Cr_(2)O_(7)+ 3H_(2)SO_(4) rarr underset("Chromyl chloride (Red vapours)")underset((D))(2CrO_(2)Cl_(2)) + Fe_(2)(SO_(4))_(3) +2KCl+ 3H_(2)O`
`CrO_(2)Cl_(2)+ 4NaOH rarr underset("Sodium chromate")(Na_(2)CrO_(4)) + 2NaCl+ 2H_(2)O`
`Na_(2)CrO_(4)+ (CH_(3)COO)_(2)Pboverset(CH_(3)COOH)(rarr) underset("Lead chromate (yellow ppt.)") underset((E )) (PbCrO_(4)) + 2CH_(3)COONa`
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