Question

2.1. Take a slender, clean test tube or a glass/bottle. Make a hole in its tid and fisi
the bottle. Pour some freshly prepared lime water in test-tube. Insert a plastic ste
through the hole in the lid in such a way that it dips in lime water. Now blow ge
through the straw for a few times.
Answer the questions that follow :
(a) What do we exhale ?
(b) What happens when we exhale on a mirror ?
(c) Why does the film of moisture appear on the mirror when we exhale on it?
(d) Give the percentage of inhale and exhale air.
Ans.​

Answer 1

Answer A - we exhale oxygen

answer b - the surface of Mirror Gates posterize