Practice MCQ Questions and answers on Chemistry-GK

Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.

Aquatic macrophytes, aquatic fungi are natural organism and evapotranspiration is a natural process by which plant losses water. Thus being natural they do not results into any change in physico-chemical characteristics of water while effluents discharged into water bodies by industrial units and domestic sewage results in to change in physico-chemical characteristics like pH, conductivity, temperature, electrical conductivity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, NH₄⁺ and NO₃^- ion contents etc.

Sulphur dioxide present in the industrial chimney exhaust causes respiratory and lung disease reduction in plant's productivity owing to acid rain and corrosion building materials.

Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using:
(i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and
(ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).

When sulphur pollutants fall on to buildings made from limestone and sandstone they react with minerals in the stone to form a powdery substance that can be washed away by rain. This is known as acid rain. Famous buildings like the Statue of Liberty in New York, the Taj Mahal in India and St. Paul's Cathedral in London have all been damaged by this sort of air pollution.

High concentration hydrocarbon pollutants in atmospheric air causes cancer.

Nitrogen is not a primary greenhouse gases in the Earth's atmosphere.

SO₂ is secondary air pollutant.

Sullage is domestic wastewater other than that which comes from the toilet. It results from food preparation, personal washing, and washing of cooking and eating utensils and clothes. It is also called greywater (to distinguish it from blackwater which describes wastes containing human excrete).

The scenes were reminiscent of the 1984 Bhopal gas disaster which killed thousands of people. At least 30 tonnes of methyl isocyanate gas was released from the Union Carbide pesticide plant in the Madhya Pradesh capital in one of the worst industrial disasters of the 20th century.