A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B) which when passed through an alkaline solution of `K_(2) [HgI_(4)]` gave a brown precipitate. The substance (A) on heating gave a gas (X) which rekindled a glowing splinter but does not give brown fumes with nitric oxide. The gas (X) is:

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of ptassium tetraiodomercurate (II) solution gives a brown ppt. the substance 'A' on heating eveolves a neutral gas 'C', which is inert at room temperature and reactive a presence of catalyst and does ont give grown fumes with nitric oxide. Q. The gas 'B' is:

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of ptassium tetraiodomercurate (II) solution gives a brown ppt. the substance 'A' on heating eveolves a neutral gas 'C', which is inert at room temperature and reactive a presence of catalyst and does ont give grown fumes with nitric oxide. Q. The gas 'C' is:

A white crystalline solid 'A' on boiling with caustic soda solution gives a gas 'B', which on passing through an alkaline solution of ptassium tetraiodomercurate (II) solution gives a brown ppt. the substance 'A' on heating eveolves a neutral gas 'C', which is inert at room temperature and reactive a presence of catalyst and does ont give grown fumes with nitric oxide. Q. The substance 'A' is:

When H_(2)S gas a passed through an ammonical salt solution X, a slightly white precipitate is formed. The X can be:

A salt, when warmed with zinc powder and an NaOH solution, gives a gas that turns a filter paper soaked with an alkaline solution of K_(2)[HgI_(4)] brown. The salt responds to the brown ring test when acetic acid is used in place of sulphuric acid. The anion present in the salt is:

A mixture of two salt was treated as follows : i. The mixture was heated with magnanese dioxide and concentrated sulphuric acid , when a yellowish -green gas was liberated. ii. The mixture on heating with sodium hydroxide solution gave a gas which turned red litmus blue iii. Its solution in water gave a blue precipitate with potassium ferricyanide and red colourtion with ammonium thiocynate iv. The mixture was boiled with potassium hydroxide and the librated gas was bubbled through an alkline solution of K_(2)HgI_(4) to give a brown precipitate identify the two salts gives ionic equation for the reaction involved in the tests (i) , (ii) and (iii).

When a crystalline compound X is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , a reddish brown gas A is evolved. On passing A into caustic soda, a yellow solution of B is formed. A yellow precipitate of C is obtained when a solution B is neutralised with acetic acid and then treated with a lead acetate solution. when X is heated with NaOH , a colourless gas is evolved which, when passed into a solution of K_(2)[HgI_(4)] , gives a reddish brown precipitate of D. ltBrgt Q. Which of the following is the composition of the brown precipitate (D) ?

The gas evolved in which of the following reactions forms the iodide of Millon's base on being passed through a solution of [HgI_(4)]^(2-) in KOH?

Identify the cations in each of the following cases : (i) NaOH solution when added to the Solution (A) gives a reddish brown precipitate. (ii) NH4OH Solution when added to the Solution (B) gives white precipitate which does not dissolve in excess.

What happen when: (a). CO_2 gas is passed through aqueous solution of Na_2CrO_4 . (b). Ammonium dichromate is heated strongly.