A black mineral (A) on heating in presence of air gives a gas (B). The mineral (A) on reaction with dilute `H_(2)SO_(4)` gives a gas (C) and a solution of a compound (D) on passing the gas (C) into an aqueous solution of (B), a white turbidity is obtained. The aqueous solution of (D) on reaction with potassium ferricyanide gives a blue compound (E). Identify (A) to (E) and give chemical equations for the reaction involved.

A black mineral (A) on heating in presence of air gives a gas (B). (A) and (B) are respectively:

Identify (A) to ( C) . (a) An inorganic iodide (A) on heating with a solution of KOH gives a gas (B) and the solution of a compound ( C) .

The aqueous solution of potassium cyanide is mixed with aqueous solution of F_e(CN)_2 . The resulting solution will give test for

(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.

(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.

Magnesium on heating in air gives (A) and (B) . On reaction with water (B) gives a colourless gas (C ).(C ) when passed through CuSO_(4) solution, gives a blue coloured solution (D) . Identify (C ) and (D) .

An inorganic iodide (A) on heating with a solution of KOH gives a gas (B) and a solution of a compound. The gas (B) on ignition in air gives a compound (C ) and water. Copper sulphate is finally reduced to the metal on passing (B) through its solution. What is true about gas (B) and compound (C ) ?

An inorganic iodide (A) on heating with a solution of KOH gives a gas (B) and a solution of a compound. The gas (B) on ignition in air gives a compound (C ) and water. Copper sulphate is finally reduced to the metal on passing (B) through its solution. The compound (C ) :

(a). An ore (A) on roasting with sodium carbonate and lime in the presence of air gives two compounds (B) and (C). (b). The solution of (B) in conc. HCl on treatment with potassiu ferroyanide gives a blue colour or precipitate of compound (D).

A ceratin compound (A) imperts a golden yellow flame and exhibits following reactions: a. When a concentrated solution of (A) is boiled with Zn power, hydrogen gas is evolved. b. When an aqueous solution of (A) is added to an aqueous solution of stannous chloride precipitate is obtained, which dissolves in excess of solution (A). Identify (A) and give equations for reactions in (ii).