The smog is essentially caused by the presence of

Frequent occurrence of water blooms in a lake indicates

Which one of the following statements regarding photochemical smog is not correct?

Carbon monoxide does not play any role in photochemical smog formation.
Photochemical smog is an oxidising agent in character.
Photochemical smog is formed through photochemical reaction involving solar energy.
Photochemical smog does not cause irritation in eyes and throat.

Solution

The oxidised hydrocarbons and ozone in presence of humidity cause photochemical smog.Hydrocarbons + O₂, NO₂, NO, O, O₃ ⟶ Peroxides,formaldehyde, peroxyacetylnitrate (PAN), acrolein etc.It is oxidising in nature and causes irritation to eyes,lungs, nose, asthamatic attack and damage plants.

Green chemistry means such reactions which :

Solution

Green chemistry may be defined as the programme of developing new chemical products and chemical processes or making improvements in the already existing compounds and processes so as to make less harmful to human health and environment. This means the same as to reduce the use and production of hazardous chemicals.i.e. correct answer is option(b).

Which of the following is/are the hazardous pollutant(s)present in automobile exhaust gases?
(i)N₂
(ii)CO
(iii)CH₄
(iv)Oxides of nitrogen

Solution

CO and oxides of Nitrogen are poisnous gases present in automobile exhaust gases.

The statement which is not correct about control of particulate pollution

In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed
Gravity settling chamber removes larger particles from the air
Cyclone collector removes fine particls in the diameter range 5-20 microns
Wet scrubbers are used to wash away all types of particulates

Solution

Particulates acquire negative charge and are attracted by the positive electrode.

The term “Bio-magnification” refers to the

growth of organism due to food consumption
increase in population size
blowing up of environmental issues by man
increase in the concentration of non-degradble pollutants as they pass through food chain

Presence of which fuel gas in the exhaust fumes shows incomplete combustion of fuel.

In a coal fired power plant electrostatic precipitators are installed to control emission of

Which one of the following pairs is mismatched

Solution

Solar energy is not responsible for greenhouse effect instead it is a source of energy for the plants and animals.

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