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Identify A to C. (a). An aqueous solut...

Identify A to C.
(a). An aqueous solution of a compoud (A) is acidic towards litmus and (A) is sublimed at about `300^@C`.
(b). (A) on treatment with an excess of `NH_4CNC` gives a red coloured compound (B) and on treatment with a solution of `K_4Fe(CN)_6` gives a blue coloured compound (C).

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Is `FeCl_3`. It gives colour of `Fe(CNS)_3` with `NH_4CNS` and chromyl chloride test for `Cl^(ɵ)`ion. The reaction are:
(a). `FeCl_3(A)+3H_2Ounderset(larr)(rarr)Fe(OH)_3+3HCl` (Acidic)
(A) sublies at `300^@C`
(b). `FeCl_3+3NH_4CNStounderset((B) red)(Fe(CNS)_3)+3NH_4CL`
`4FeCl_3+3K_3Fe(CN)_6tounderset((C) blue)(Fe_4[Fe(CN)_6]_3)+12KCl`
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(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.

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