Metallurgy — Chemistry STD 10 — Question

Give balanced chemical equation for the following :
(a) Ammonia and oxygen in the presence of catalyst.
(b) Oxidation of carbon with concentrated nitric acid.

State two relevant observation of the following:
Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess

State one appropriate observation of the following:
Which gas is evolved when potassium sulphite with dilute hydrochloric acid.

Write the equation for the following lab preparations:
Methanol from Iodomethane.

Copy and complete the following table which refers to the action of heat on some carbonates:

Carbonate	Colour of residue on cooling
Zinc Carbonate
Lead Carbonate
Copper Carbonate

(a) Dilute nitric acid is generally considered a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?
(b) Write the equation for the reaction of dilute nitric acid with copper.

What would happen if
Calcium oxide is used to dry hydrogen chloride.

The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.

State one appropriate observation of the following:
Concentrated HCl is made to react with mangesediaoxide

(a) What do you understand by the term roasting of ore?
(b) What is the importance of roasting in the extraction of metals?