Question

4.
How will you show that air is dissolved in water?
5. Why does a lump of cotton wool shrink in water?​

Answer 1

Answer:

4) We can show that air is dissolved in water with the help of following activity: Take some water in a glass or metal container like pan and heat it. Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. ... This shows that air is dissolved in water.

5) A lump of cotton wool has a lot of air trapped inside the space present in its fibres. When this lump of cotton is immersed in water, all the air is replaced by water. Due to this the cotton lump shrinks down.

Answer 2

Answer:

We can show that air is dissolved in water with the help of following activity:

Explanation:

Take some water in a glass or metal container like pan and heat it. Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. ... This shows that air is dissolved in water.

hope it helped