Question

	Name of Gas		% in Normal Air
I	Oxygen	A	0.932
II	Argon	B	0.0005
III	Neon	C	20.99
IV	Helium	D	0.0018

1. I-C,II-D, III-A, IV-B
2. I-C, II-A, III-D, IV-B
3. I-C, II-B, III-A, IV-D
4. I-C, II-D, III-B, IV-A

Answer 1

Correct Answer - Option 2 : I-C, II-A, III-D, IV-B

The correct answer is Option 2 i.e.I-C, II-A, III-D, IV-B.

• Atmosphere: 
  • It is a mixture of numerous gases that surrounds the earth from all sides and is held to the earth's gravitational attraction and rotates with it.
  • It is an important component of the ecosystem because it supports life on the earth.
• Composition of Atmosphere: 
  • About 97% of the air is concentrated in the lower 29 Km which is in the Troposphere.
• The following table shows the composition of different gases in the atmosphere with the respective percentage.

  GAS NAME	VOLUME(%)
  Nitrogen	78.03
  Oxygen	20.99
  Argon	0.932
  Carbon dioxide	0.03
  Neon	0.0018
  Helium	0.0005
  Hydrogen	0.00005
  Xenon	0.0000087