(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.

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).

(i) An aqueous solution of a compound A is acidic towards litmus and A sublimes at about 300^(@)C (ii) A solution of A, on treatment with an excess of NH_(4)SCN , gives a red compound, and on treatment with a solution of K_(4)[Fe(CN)_(6)] , gives a blue compound. (iii) The solid A, on being heated with an 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 vapours of D into a solution of NaOH and then adding the solution of acetic acid and lead acetate, a yellow precipitate of a compound E is obtained. Q. Can compound A be prepared in the anhydrous form by strongly heating its hydrated crystals?

FeCl_(3) is acidic towards litmus. On treatment with excess of NH_(4)SCN it gives red coloured compound (A) and on treatment with excess of K_(2)Cr_(2)O_(7) in the presence of conc. H_(2)SO_(4) , it evolves deep red vapours of (B) on passing the vapours of (B) into NaOH , then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C) The compound B is

FeCl_(3) is acidic towards litmus. On treatment with excess of NH_(4)SCN it gives red coloured compound (A) and on treatment with excess of K_(2)Cr_(2)O_(7) in the presence of conc. H_(2)SO_(4) , it evolves deep red vapours of (B) on passing the vapours of (B) into NaOH , then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C) The compound A is

FeCl_(3) is acidic towards litmus. On treatment with excess of NH_(4)SCN it gives red coloured compound (A) and on treatment with excess of K_(2)Cr_(2)O_(7) in the presence of conc. H_(2)SO_(4) , it evolves deep red vapours of (B) on passing the vapours of (B) into NaOH , then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C) What is the hybridisation of chromium in compound (C) ?

Sodium chloride on heating with aqueous solution of K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) produces:

Solid KCl, when heated with solid K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , gives red vapours (a) that turn NaOH solution yellow (b). The yellow solution, when acidified with acetic acid and treated with lead acetate, gives a yellow precipitate (c). which of the following is true with respect to a, b and c?

When a mixture of solid NaCl and solid K_(2)Cr_(2)O_(7) is heated with concentrated H_(2)SO_(4) deep red vapours are obtained.This is due to the formation of:

The evolution of a red-brown gas on heating a salt with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) can arise from:

NH_(4)SCN gives red colour with (s) ____ due to the formation of (b) _____.