The Taj Mahal is threatened by environmental pollution, especially by acid rain due to sulphur dioxide emitted from Mathura refinery.

Correct Option: D

The Taj Mahal is threatened by environmental pollution, especially by acid rain due to sulphur dioxide emitted from Mathura refinery.

The content of CO₂ in atmospheric air is 0.034%. The main contributors to air are N₂ and O₂.

Correct Option: A

The content of CO₂ in atmospheric air is 0.034%. The main contributors to air are N₂ and O₂.

Carbon monoxide, when inhaled, combines with blood haemoglobin to form carboxy-haemoglobin at a rate 210 times faster than the rate at which oxygen forms oxyhaemoglobin. Thus, respiration is impaired.

Correct Option: B

Carbon monoxide, when inhaled, combines with blood haemoglobin to form carboxy-haemoglobin at a rate 210 times faster than the rate at which oxygen forms oxyhaemoglobin. Thus, respiration is impaired.

CO₂ is a green house gas which traps the solar radiation i.e. heats up the earth’s atmosphere.

Correct Option: B

CO₂ is a green house gas which traps the solar radiation i.e. heats up the earth’s atmosphere.

Primary pollutant is that which persists in the form in which it is released in the environment eg. CO. A secondary pollutant is one which is formed from another pollutant due to change or reaction. e.g. PAN (Peroxy acytyl nitrate).

Correct Option: C

Primary pollutant is that which persists in the form in which it is released in the environment eg. CO. A secondary pollutant is one which is formed from another pollutant due to change or reaction. e.g. PAN (Peroxy acytyl nitrate).