Give reasons :  Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.

$(a)$ What will be the action of gas on

$(i)$ dry litmus paper ?

$(ii)$ moist litmus paper ?

$(b)$ Write a balanced chemical equation for the reaction taking place.

Which metals do not corrode easily ?

Give reasons : Sodium, potassium and lithium are stored under oil.

Food cans are coated with tin and not with zinc because

State two ways to prevent the rusting of iron.