FBISE, NCP & NBF-aligned resources for Classes 9–12
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Chemistry Chapter 11 : Test Yourself
1 / 4
Which gas has the highest percentage in the air?
Reasoning: Air contains about 78% nitrogen (N₂), which is the highest among all gases in the atmosphere.
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Which is / are responsible for acid rain?
Reasoning: Both sulfur dioxide (SO₂) and nitrogen dioxide (NO₂) react with water vapor in air to form acids (H₂SO₄ and HNO₃), causing acid rain.
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Which is reddish brown gas?
Reasoning: Nitrogen dioxide (NO₂) is a reddish-brown toxic gas formed in combustion processes.
4 / 4
Most air pollution is caused by:
Reasoning: Burning fossil fuels (coal, petrol, diesel) releases harmful gases like CO, SO₂, NOₓ and particulate matter, which are the main sources of air pollution.
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