State giving reasons if:

(a) zinc and aluminium can be distinguished by heating the metal powder with concentrated sodium hydroxide solution.

(b) calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.

Identify the substance 'R' based on the information given below :

The pale green solid 'R' turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.

When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.

Question 2

Give a chemical test to distinguish between :

(a) Sodium chloride soln. and sodium nitrate soln.

(b) Hydrogen chloride gas and hydrogen sulphide gas.

(c) Calcium nitrate soln. and zinc nitrate soln.

(d) Carbon dioxide gas and sulphur dioxide gas.

(e) Sodium carbonate and sodium sulphite

(f) Ferrous nitrate and lead nitrate.

(g) Manganese dioxide and copper (Il) oxide.

(h) Sodium nitrate and sodium sulphite [using dilute sulphuric acid].

(i) Sodium chloride and sodium sulphide

(j) Sodium hydroxide solution and ammonium hydroxide solution.

(k) Ammonium sulphate and sodium sulphate.

(l) Sulphuric acid from nitric acid and hydrochloric acid.

(m) Magnesium chloride and magnesium nitrate solution

(n) Zinc sulphate solution and zinc chloride solution

(o) Iron (II) chloride soln. and iron (III) chloride soln.

(p) Calcium nitrate soln. and calcium chloride soln.