TRUE / FALSE

Question 11 Mark

Air is a mixture and not a compound since the components of air cannot be separated by physical methods.

Answer

False.
Correct statement: Air is a mixture and not a compound since the components of air can be separated by physical methods.

Question 21 Mark

Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.

Answer

True.

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Question 31 Mark

Carbon dioxide, water vapour and energy in the form of heat are evolved during respiration.

Answer

True.

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Question 41 Mark

The percentage of carbon dioxide in the air is between 0.2 to 0.4%.

Answer

True.

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Question 51 Mark

The mesosphere in the atmosphere, contains most of the air, fit for respiration

Answer

False.
Correct statement: The troposphere in the atmosphere, contains most of the air, fit for respiration.

Question 61 Mark

The major component of air is oxygen.

Answer

False
Correct Statement: The major component of air is nitrogen.

Question 71 Mark

The composition of air was discovered by Lavoisier.

Answer

True

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Question 81 Mark

Carbon dioxide is given out during photosynthesis

Answer

False
Correct Statement: Oxygen is given out during photosynthesis.

Question 91 Mark

Air is a compound.

Answer

False
Correct Statement: Air is a mixture.

CHEMISTRY TRUE / FALSE