Question

Give scientific reasons.

a. Foam accumulates on a the surface of ‘dal’ kept for a long time in summer.

b. Why are naphthalene balls kept with clothes to be put away.

Answer 1

a. When dal is soaked in water for a long time in summers, denatured protein are released from dal which mixes with water and form foam. This process occurs quickly in summers because of higher temperatures.

b. Naphthaline balls sublime slowly. When they are placed in clothes, they sublime without leaving any residue and there role is to ward off any kind of insects which could damage the clothes.