Complete the following sentences by choosing the correct answer from the brackets:

(a) The salt that can be prepared by Direct Combination is …………… . [FeCl₃ / FeCl₂]

(b) The metallic oxide which can be reduced by using common reducing agents is …………… . [Fe₂O₃ / Al₂O₃]

(c) The metal nitrate which on thermal decomposition forms a black residue is …………… . [zinc nitrate / copper nitrate]

(d) During the electrolysis of copper sulphate solution, if …………… is used as electrodes, the colour of the electrolyte does not fade. [copper / platinum]

(e) The process of heating the concentrated ore in a limited supply or absence of air is …………… . [roasting / calcination]

State the terms for the following:

(a) The group obtained by removing one hydrogen atom from the parent alkane.

(b) Two metal plates or wires through which the current enters and leaves the electrolytic cell.

(c) The amount of substance which contains the same number of units as the number of atoms in carbon-12.

(d) The tendency of an atom to pull a shared pair of electrons towards itself in a compound.

(e) The formula which represents the simplest ratio between the atoms of elements present in a compound.

Rewrite the following statements by adding the correct word as shown in the example:

Example:

Given Statement: Ammonia changes moist red litmus to blue.

Correct Statement: Aqueous ammonia changes moist red litmus to blue.

(a) Sulphuric acid acts as a dehydrating agent.

(b) Ammonia reacts with chlorine to give ammonium chloride and nitrogen.

Identify only the anion present in the following compound:

(a) The compound on heating produces a colourless, odourless gas which turns lime water milky and has no effect on acidified potassium dichromate solution.

(b) The solution of the compound which on treating with concentrated sulphuric acid and freshly prepared ferrous sulphate solution produces a brown ring.