Question

Tick the most appropriate answer

Air consist of

• A. oxygen only
• B. nitrogen only
• C. ${\mathrm{CO}}_2$ only
• D. all of these

Answer 1

The correct option is D

all of these

• Air is composed of a mixture of gases
• Nitrogen$\left({\mathrm{N}}_2\right)$ and oxygen$\left({\mathrm{O}}_2\right)$ are the two main gases that make up most of the air.
• Around 78% of air is nitrogen while around 20% is oxygen.
• Water vapor makes up about 1% of air but its amount can vary from place to place.
• Argon$\left(\mathrm{Ar}\right)$, another gas makes up the most of the remaining 1% (0.97%), with carbon dioxide$\left({\mathrm{CO}}_2\right)$ only around 0.03%.

Hence, option (D) is correct.