White heavy precipitates are formed when `BaCl_(2)` is added to a clear solution of compound A. Precipitates are insoluble in dilute HCl. Then, the compound A is :

A black coloured compound (A) on reaction with dilute H_(2)SO_(4) gives a gas (B) which on passing in a solution of an acid ( C) gives a white turbidity (D) .Gas (B) when passed in an acidified solution of a compound (E) gives a precipitate (F) soluble in dilute HNO_(3) .After boiling this solution when an excess of NH_(4)OH is added a intense blue coloured compound (G) is formed. To this solution on addition of acetic acid and aqueous K_(4)[Fe(CN)_(6)] a chocolate brown precipitate (H) is obtained.On addition of an aqueous solution of BaCl_(2) to an aqueous solution of (E) a white precipitate insoluble in dilute HCl is obtained. Identify the compounds from (A) to (H) .

To the clear solution of compound (X) a solution of barium chloride ( BaCl_2 ) is added to give a white precipitate which does not dissolve in dilute HCl. The compound (X) is:

Dilute sulphuric acid will produce a white precipitate when added to a solution of

To a clear solution of compound (X), a solution of BaCl_(2) is added and a heavy white precipitate is formed which does not dissolve in dil. HCI. The compound (X) is

A balck coloured compound (A) on reaction with dilute H_(2)SO_(4) gives a gas (B) which on passing in a solution of an acid (C ) gives a white turbidity (D). Gas (B ) when passed in an acidified solution of a compound (E ) gives a precipitate (F) soluble in dil HNO_(4) . After boiling this solution when an excess of NH_(4)OH is added, a blue coloured compound (G) is formed. To this solution on addition of acetic acid and aqueous K_(4)[Fe(CN)_(6)] a chocolate precipitate (H) is obtained. On addition of an aqueous solution of BaCl_(2) to an aqueous solution of (E) , a white precipitate insolution in HNO_(3) is obtained. Identify (A) to (H).

To a clear solution of compound (X), a solution of BaCl_2 is added and a heavy white precipitate is formed which does not dissolve in dil. HCI. The compound (X) is