(a) Give the chemical names and formula of main ores of

1. aluminium
2. iron
3. zinc

(b) Write the principle metal(s) of the following alloys.

1. Brass
2. Stainless steel

Distinguish between the following as directed.

(a) Ethene and ethyne (on the basis of preparation)

(b) Sodium carbonate and sodium sulphite (using dilute hydrochloric acid)

An element X has atomic number 35. Answer the following questions.

(a) State the period and group to which it belongs.

(b) It is a metal or non-metal?

(c) Write a formula between X and hydrogen.

Choose the substances given below to answer the following questions.

Ferrous chloride

Iron (II) sulphate

Iron (II) chloride

Copper chloride

Aluminium oxide

Copper (II) oxide

(a) A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide.

(b) The salt which gives a dirty green precipitate with sodium hydroxide solution.

(c) The metal oxide which can react with acid as well as alkali.