question_answer

Examine the following statements and select the correct answer using codes given below:

1. Atmosphere is odourless, tasteless and colourless

2. Atmosphere is held to the earth by its gravitational force and is an integral part of the earth.

3. Hydrogen present in the air is a heavy gas and is confined to the lower layers of the atmosphere only.

4. Dust particles present in the atmosphere act as hydroscopic matter.

A) 1 and 2 only

B) 1, 2 and 3 only

C) 2, 3 and 4 only

D) 1, 2 and 4 only