Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions? A. MgSO₄ + Fe B. ZnSO₄ + Fe
C. MgSO₄ + Pb
D. CuSO₄ + Fe

(a) Gold

(b) Copper

(c) Zinc

(d) Mercury

Solution|||

(a) no displacement reaction will take place with the solution of copper sulphate, as gold is less reactive then the copper.

(b) there will not be any reaction between copper and copper sulphate.

(c) copper will be replaced by zinc from the copper sulphate

An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.

A non-metal A which is the largest constituent of air, when heated with H₂ in 1:3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O₂ it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D which acts as a strong oxidising agent.

(a) Identify A, B, C and D.

(b) To which group of periodic table does this non-metal belong?

Give the formulae of the stable binary compounds that would be formed by the combination of following pairs of elements.

(a) Mg and N₂

(b) Li and O₂

(c) Al and Cl₂

(d) K and O₂

Column I

(i) Electrolytic reduction

(ii) Reduction with Carbon

(iii) Reduction with Aluminium

Column II

(a) Aluminium

(b) Zinc

(c) Sodium

(d) Iron

(e) Manganese

(f) Tin