An element forms an oxide $A_{2}O_{3}$ which is acidic in nature. Identify $A$ as a metal or non-metal.

Give reasons for the following:
$(i)$ Alloys are used in electrical heating devices rather than pure metals.
$(ii)$ Gold ornaments look new even after several years of use.
$(iii)$ An iron grill should be painted frequently.

Give reasons for the following:
$(a)$ We can store copper sulphate solution in a silver vessel but not silver nitrate solution in a copper vessel.
$(b)$ The reaction of zinc with dilute nitric acid does not produce hydrogen gas.
$(c)$ Food cans are coated with tin rather than zinc.

Give reasons for the following:
$(a)$ Generally,metals are not found in their free state.
$(b)$ Metals are good conductors of heat.

An alloy is

Give reasons for the following:
$(i)$ Most metals conduct electricity well.
$(ii)$ The reaction of iron $(III)$ oxide,$Fe_{2}O_{3}$,with heated aluminium is used to join cracked machine parts.
$(iii)$ Sodium,potassium,and lithium are stored under oil.