Given below is the diagram for the laboratory preparation of Nitric Acid.

(a) Name the reactant labelled Y.

(b) Write a balanced equation for the reaction between Y and KNO₃.

(c) The complete apparatus is made up of glass. Why?

(d) State why concentrated HNO₃ appears slightly yellowish in colour when left standing in a glass bottle for a long time.

Answer the following questions related to the electrolytic reduction of pure Alumina by Hall Heroult’s process.

(a) The reaction occurring at the anode.

(b) The reaction occurring at the cathode.

Write the balanced equations for the following reactions:

(a) Potassium bicarbonate reacts with dilute HCl.

(b) Laboratory preparation of ethane using soda lime.

(c) Warm water is added to Aluminium nitride.

Nitrogen and hydrogen combine in the presence of a catalyst to give ammonia gas. With reference to the above reaction:

(a) Name the catalyst used.

(b) At what temperature does the above reaction occur?

(c) What optimum pressure should be maintained during the reaction?