Question

The concentration of which gas is highest in our environment? (1) Oxygen (2) Hydrogen (3) Nitrogen (4) Carbon dioxide.

Answer 1

The correct answer is option (3) – Nitrogen

• Among different gases that exist in the Earth’s atmosphere, 78% of the earth’s gases in the atmosphere is made up of Nitrogen gas.

Composition of Atmosphere

Earth’s atmosphere is composed of the following:

1. Gases
2. Water vapour
3. Dust particles

Different Gases in Atmosphere – Important Facts

• Almost 21% of the earth’s gases in the atmosphere consists of Oxygen. The other gases which are found in the atmosphere are Argon, Carbon dioxide, Neon, Helium, Krypton, Xenon, and Hydrogen.
• Carbon dioxide is present in the atmosphere, only upto a height of 90 Km.
• At a height of 120 Km, the concentration of oxygen in the atmosphere is almost nil.
• The greenhouse effect that we see on earth is largely due to carbon dioxide.
• Although concentration of other gases in the atmosphere has almost remained constant, the concentration of carbon dioxide has been steadily increasing due to burning of fossil fuels, which is the major source of energy for almost all nations on earth.
• The ultra violet rays of the sun are absorbed by the ozone layer in the atmosphere which lies between 10 km and 50 km from the earth’s surface.