Element A has 2 electrons in its M shell. Element B has atomic number 7.

(a) Write equations to show how A and B form ions.

(b) If B is a diatomic gas, write the equation for the direct combination of A and B to form a compound.

(c) If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the …………. and B at the ………… of the electrolytic cell.

Element M forms a chloride with the formula MCl₂ which is a solid with high melting point. M would most likely be in the group in which ………….. is placed.

(a) Na
(b) Mg
(c) Al
(d) Si

Compound X consists of molecules.

Choose the letter corresponding to the correct answer from the options A, B, C and D given below :

(i) The type of bonding in X will be :

    A. ionic
    B. electrovalent
    C. covalent
    D. molecular

(ii) X is likely to have a :

    A. low melting point and high boiling point.
    B. high melting point and low boiling point.
    C. low melting point and low boiling point.
    D. high melting point and high boiling point.

(iii) In the liquid state, X will :

    A. become ionic,
    B. be an electrolyte,
    C. conduct electricity,
    D. not conduct electricity.

The property which is characteristic of an electrovalent compound is that :

1. it is easily vaporized
2. it has a high melting point
3. it is a weak electrolyte
4. it often exists as a liquid