Practice MCQ Questions and answers on Chemistry-GK

Tetra ethyl lead (C₂H₅)₄ Pb is used as an antiknock compound . It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.

Lead is the most hazardous metal pollutants of automobile exhausts. Its effects are lead poisoning, anaemia, kidney disease, convulsions and also causes brain damage in children. It also affects central nervous system and distorts the red blood corpuscles.

The most common cause of pollution of air is Sulphur dioxide.

An aerosol is a colloid of fine solid particles or liquid droplets, in air or another gas. The liquid or solid particles have diameter mostly smaller than 1 µm. They remain suspended in air for longer periods of time are transported to distances by winds. The finer particles could also be more easily re-suspended by subsequent wind action.

Mercury is emitted into air by burning garbage.

'Acid rain' is caused due to air pollution by Nitrous oxide and sulphur dioxide.

Over 500,000 people were exposed to methyl isocyanate (MIC) gas. The highly toxic substance made its way into and around the small towns located near the plant. Estimates vary on the death toll. The official immediate death toll was 2,259.

A trickling filter, also known as percolating filter, is an artificial bed of stone or broken brick material over which waste water or sewage is allowed to sprinkle or to trickle. It is then collected through the under drainage system.

Main source of lead pollution is from leaded gasoline.

Carbon Monoxide (CO) is one of the most harmful pollutants. Other gaseous air pollutants are carbon dioxide, oxides of sulfur, nitrogen, hydrocarbons, hydrogen sulphide, ozone and other oxidants. Particulate pollutants include mist, dust, smog, fumes etc.