Air and Atmosphere — Important Questions
ICSE · Class 7 · Chemistry
42 important questions from Air and Atmosphere for ICSE Class 7 Chemistry, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Air and Atmosphere
What is the percentage of carbon dioxide in air?
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0.03% to 0.04%
Carbon dioxide is present in air in a very small amount, about 0.03% to 0.04% by volume.
Which scientist proved in 1774 that air is a mixture of gases?
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Antoine Lavoisier
Antoine Lavoisier proved in 1774 that air is a mixture of gases.
Which gas was first discovered by Joseph Priestley in 1774?
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Oxygen
Joseph Priestley discovered oxygen in 1774 by heating mercury(II) oxide.
Which gas is essential for respiration?
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Oxygen
Living beings use oxygen in respiration to release energy from food.
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