Chemistry - Study Mode

[#271] Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called
Correct Answer

(C) Aerosols

Explanation

Solution: 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.

[#272] Mercury is emitted into air by
Correct Answer

(B) Burning garbage

Explanation

Solution: Mercury is emitted into air by burning garbage.

[#273] 'Acid rain' is caused due to air pollution by
Correct Answer

(D) Nitrous oxide and sulphur dioxide

Explanation

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

[#274] Gas released during Bhopal tragedy was :
Correct Answer

(D) Methyl isocyanate

Explanation

Solution: 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.

[#275] The filter over which sewage is sprinkled is called as
Correct Answer

(A) Trickling filter

Explanation

Solution: 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.