Choose from the following list of the substances - Acetylene gas, aqua fortis, coke, brass, barium chloride, bronze, platinum. The substance which is an alloy of zinc, copper and tin.

(i)    Name a metal found abundantly in the earth's crust.
(ii)   Difference between calcination and roasting?
(iii)  Name the process used for the enrichment of sulphide ore.
(iv)  Write the chemical formulae of one main ore each of iron and aluminium.
(v)   Write the constituents of the electrolyte for the extraction of aluminium.

The metallic oxide/s which cannot be reduced by normal reducing agents ?

1. Magnesium oxide
2. Copper (II) oxide
3. Zinc oxide
4. Iron (III) oxide

Match the properties and uses of alloys in List 1 with the appropriate answer from List 2.

List 1:

1. The alloy contains Cu and Zn, is hard and is used in decorative articles.
2. It is stronger than Aluminium, light and is used in making light tools.
3. It is lustrous, hard, corrosion resistant and used in surgical instruments.
4. Tin lowers the melting point of the alloy and is used for soldering purpose.
5. The alloy is hard, brittle, takes up polish and is used for making statues.

List 2 :

(A) Duralumin

(B) Brass

(C) Bronze

(D) Stainless steel

(E) Solder