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An aqueous solution of a compound (A) is acidic towards litmus and the solid has the property to sublime at 300^(@)C. The compound (A) on treatement with an excess of NH_(4)SCN gives a red coloured compound (B) an on treatement with a solution of K_(4)[Fe(CN)_(6)] gives a blue coloured compound (C ) . The compound (A) on heating with excess of K_(2) Cr_(2) O_(7) and concentrated H_(2)SO_(4) evolves deep red vapours of (D) . On passing these vapours through NaOH solution and then adding acetic acid and lead acetate solutions, a yellow precipitate of compound (E ) is obtained . Identifycompounds ( A) to (E ) and give balanced chemical equation for each reaction involved. |
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Answer» Solution :`FeCl_(3)` solution is acidic and the solid sublimes at `300^(@)C`. Its solution reacts with `NH_(4)SCN` to give red coloured ferric thiocyanateand 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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