Practice MCQ Questions and answers on Chemistry-GK

The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. When these gases are ranked by their direct contribution to the greenhouse effect in percentage terms, the most important are: Water vapour: 36-72 per cent; Carbon dioxide: 9-26 per cent; Methane: 4-9 per cent; and Ozone: 3-7 per cent.

Nitrous oxide is produced by combustion of fossil fuels, livestock wastes, breakdown of nitrogenous fertilizers in soil, nitrate contaminated water, nylon production and other industrial processes.

Carbon dioxide (CO₂) is the primary greenhouse gas emitted through human activities.

The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the environment, with the deposition of radioactive materials in many parts of Europe.

An aerosol (abbreviation of "aero-solution") is a suspension of fine solid particles or liquid droplets in air or another gas.

Acid rain is caused by sulphur dioxide and nitrogen dioxide.

3 leak of toxic methyl isocyanate gas at a Union Carbide plant in the central Indian city of Bhopal produced history's worst industrial disaster, stunning India and the world.

3 leak of toxic methyl isocyanate gas at a Union Carbide plant in the central Indian city of Bhopal produced history's worst industrial disaster, stunning India and the world.

The coastal belt of Karunagappally, Kerala is known for high background radiation from thorium-containing monazite sand. This has increased the risk of cancer in this area. So, the correct answer is 'Thorium'.