Give reason
Why do the pooris puff up in hot oil?

Give reason Why does the balloon inflate when the bottle is put in hot water?

Give a reason why - For the preparation of nitric acid in the laboratory ,the complete apparatus is made up of glass.

Give reasons why? For the preparation of hydrochloric acid, hydrogen is not directly absorbed in water.

Give reason why the smoke from a fire looks white.

Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

.Give reason for the following: (a) School bells are made up of metals. (b) Electric wires are made up of copper.

Give reasons for each of the following: Noble gases do not form compounds readily.

Give reasons for the following : Why do metals deposit at the cathode and not at the anode when their fused salts are electrolysed ?

Give reason : Inert gases do not formions.

Give reasons for the following: Brisk effervescence is seen when oil of vitriol is added to sodium carbonate.