Galvanisation is a method of protecting:

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.

Which of the following metals is obtained in free state in nature?

State whether the following statement is true or false:
Copper does not burn in air, but the hot metal is coated with a black-coloured layer of copper $(II)$ oxide.

What is formed when boiling sulfur reacts with dihydrogen gas?

Which of the following is a compound of hydrogen and oxygen?