Test: Air around us - 1 - Class 2 MCQ

3/4^th portion of air is nitrogen.

Composition of air (Percentage by volume), nitrogen = 78.03, oxygen = 20.99, carbon dioxide = 0.03, noble gases = 0.95 and some water vapours, dust particles and other impurities.

4:1 is the ratio of nitrogen to oxygen in the air.

Oxygen does not bum but supports burning.

4. It is a compound.

Explanation:

• Air is not a compound; it is a mixture of various gases, primarily nitrogen, oxygen, carbon dioxide, and small amounts of other gases.
• Air occupies space, meaning it has volume.
• Air is transparent, allowing light to pass through.
• Air can be considered a solution because it is a homogeneous mixture of gases.

Thus, the incorrect property is that air is a compound.

We use oxygen and produce carbon dioxide.

Air is all around us, a thick layer of air surrounds the earth, this blanket of air is called atmosphere.

Air in motion is called wind.

Air is a mixture of various gases, water vapours and dust particles.

Air is present everywhere.