State the terms for the following:

State the terms for the following:

(a) A substance which when dissolved in water forms hydronium ion as the only positive ion.

(b) A type of covalent bond in which electrons are shared equally between the combining atoms.

(c) The process by which a base metal is coated with another metal, either to protect the metal or to give it an attractive appearance.

(d) The type of reaction characteristic for alkanes.

(e) The substance which oxidises the other substance and itself gets reduced.