ii. Copper sulphide is treated with dilute hydrochloric acid.

iii. Excess of chlorine gas is reacted with ammonia gas.

iv. A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed
by the addition of ammonium hydroxide solution.

v. Electricity is passed through molten lead bromide.

Give suitable chemical terms for the following:

i. A bond formed by a shared pair of electrons with both electrons coming from the
same atom.

ii. A salt formed by incomplete neutralisation of an acid by a base.

iii. A reaction in which hydrogen of an alkane is INSERT IGNORE INTO d by a halogen.

iv. A definite number of water molecules bound to some salts.

v. The process in which a substance absorbs moisture from the atmospheric air to
become moist and ultimately dissolves in the absorbed water.

Give a chemical test to distinguish between the following pairs of compounds:

i. Sodium chloride solution and sodium nitrate solution

ii. Hydrogen chloride gas and hydrogen sulphide gas

iii. Ethene gas and ethane gas

iv. Calcium nitrate solution and zinc nitrate solution