A mineral from which the metal can be extracted economically and conveniently is known as:

1. Matrix
2. Ore
3. Flux
4. Alloy

The following sketch represents the electroplating of an Iron cup with Nickel metal. Study the diagram and answer the following questions:

(a) During electroplating the iron cup is placed at the cathode. Why?

(b) Name the ion that must be present in the electrolyte.

(c) State one condition that is necessary to ensure that the deposit is smooth, firm and even.

(d) Write the reaction taking place at the cathode.

(e) What change would you observe at the anode?

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.