Question

The percentage of nitrogen present in the atmosphere is 78 percent.

• A. True
• B. False

Answer 1

The correct option is A True

• Air consists of many gases mainly Nitrogen$\left(\mathrm{N}\right)$, Oxygen$\left(\mathrm{O}\right)$, Carbon dioxide$\left({\mathrm{CO}}_2\right)$, and inert gases.
• Apart from these gases, small quantities of water vapour, dust and smoke are also present in the air.
• The amount of these components varies in different regions from time to time.

Components of air Percentage by volume:

Components of air	Percentage by volume
Nitrogen	78%
Oxygen	21%
Carbon dioxide	0.03%
Inert gases such as Helium$\left(\mathrm{He}\right)$, Neon$\left(\mathrm{Ne}\right)$, Argon$\left(\mathrm{Ar}\right)$, Krypton$\left(\mathrm{Kr}\right)$, Xenon$\left(\mathrm{Xe}\right)$, and Radon$\left(\mathrm{Rn}\right)$.	0.9%
Water vapour	Varies
Others like dust, smoke, pollutants, etc.	Varies

Hence, the given statement is true.