Which one of the following pollutants is produced by combustion of coal, petrol and diesel?

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Sulphur dioxide (SO2) is produced by the combustion of sulphur containing fuels such as coal, petrol and diesel.

The products formed on hydrolysis of chlorine nitrate are ____ .

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When chlorine nitrate is hydrolysed, it forms hypochlorous acid and nitiric acid. ClONO2 + H2O → HOCl + HNO3 ClONO2 + HCl → HCl + HNO3

Depletion of ozone layer can be prevented by ____ .

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Option A , C and D would not cause any remedy to prevent depletion of ozone layer instead it would increase due to more of global warming and waste gases thrown into the atmosphere. But forestation would reduce the depletion because plants would produce more of oxygen into the atmosphere and consume carbon dioxide, reducing the global warming.

Which of the following statements is incorrect about the harmful effect of the oxides of nitrogen?

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Nitrogen dioxide causes serious injury to vegetation as it damages the leaf.

In the presence of UV light, oxygen is converted to ozone in the stratosphere.

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Urban areas are more industrialised than rural areas. So, the gases thrown into the atmosphere is more which cause lung disease. The gas responsible for the lung disease is sulphur dioxide. Carbon dioxide causes global warming and is not much poisonous. Nitrogen and oxygen are present in air. These are not poisonous.

The percentage of oxygen present in the atmosphere is about _______.

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The percentage of oxygen present in the atmosphere is about 20.94%.

____is an air pollutant that is not released by automobiles.

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Fly ash is an pollutant released by thermal power plants and not by automobiles. Options A, C and D are gases which are released by automobiles during the combustion reaction of petroleum products.

Which of the following statements is true?

Correct! Wrong!

Options A, B and C are not true, as they are harmful. CO does induce cardiovascular disorder, even in small amounts. SO2, at higher concentration, cause stiffness in flower. SO2also makes it bleach. Nitrogen oxides retard the rate of photosynthesis. However, normal concentration of carbon dioxide is not an air pollutant, as it is used by plants in photosynthesis and gives out oxygen. Only at very high concentration, they c

The gases in air which form acid rain are are ____.

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The gases in air which form acid rain are are NOx and SOx. (x stands for the number 1, 2 or 3). It may be sulphur dioxide or trioxide, carbon monoxide or dioxoide, nitrogen monoxide or dioxide or trioxide. It is only oxides of nitrogen and sulphur in air that combine with water to form acid rain. Reactions are: NO + O3 → NO2 NO2 + O3 → NO3 NO3 + NO2 → N2 O5 N2 O5 + H2O → HNO3 SO2 + O2 → SO3 (in the presence of NO or metal ions) SO2 + O2 → SO3

The free radical, ____, released by powerful UV radiation causes ozone depletion.

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In the stratosphere, the CFC Chlorofluoro carbons are homolyitcally cleaved by the UV radiations:- The reactions are as follows: CF2 Cl2 → .CF2Cl + .Cl CFCl3 → .CFCl2 + .Cl . CFCl3 → .CFCl2 ClO. +O → .Cl + O2 Hence, it is the free chloride radical which is produced by the UV radiation from the CFC, which causes depletion of ozone.

Depletion of ozone layer causes ____.

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Depletion of ozone layer causes the ultraviolet rays to fall directly onto the earth's surface which causes skin cancer, as the skin is exposed to the rays.blood cancer

Photochemical smog is formed by ____.

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Hydrocarbons and oxides of nitrogen form photochemical smog. Smoke and fog form smog. Carbon-black is also called as soot which forms a suspension in air with moisture. Carbon monoxide and oxides of nitrogen remain as air pollutants, in air.

The two agents that deplete ozone are ____ and ____.

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The two agents that deplete ozone are CHLORFLUOROCARBONS and NITIRC OXIDE. These are the two agents which produce free radicals due to UV radiations and reduce ozone to oxygen.

____is produced by a reaction of ultraviolet light rays.

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In the presence of UV light, oxygen is converted to ozone in the stratosphere.

PAN stands for ____.

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PAN is an abbreviation for PEROXY ACETYL NITRATE - CH3 (CO) OO NO2.

A _______ is defined as an undesirable matter present in excess in the environment.

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A pollutant is defined as an undesirable matter present in excess in the environment.

__________ is released by refrigerators and air conditioning systems.

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Chlorofluoro carbon is released by refrigerators and air conditioning systems.

The acids formed in the process of acid rain are _____ .

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In the atmosphere, industrial gases and automobile waste gases thrown into the air get absorbed by the moisture and form sulphuric acid and nitric acid, which is the cause for acid rain. Carbonic acid and Nitrous acid are unstable acids which decompose into their respective oxides (CO2 and NO2).

Infectious diseases like Dengue, Yellow fever, sleeping sickness, etc. are caused due to ____.

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High temperature that is global warming

The proportion of carbon dioxide in the atmosphere is about _______.

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The proportion of carbon dioxide in the atmosphere is about 0.03%

Locking of _______ and _______ free radicals is called scavenging.

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Locking of chlorine monoxide and chlorine free radicals is called scavenging.

The irritant red haze in the traffic and congested places is due to _____.

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Oxides of carbon, sulphur and hydrocarbons are colourless gases. They can cause irritation. Most of the gases coming from automobiles which are red in colour are oxides of nitrogen, which are irritants.

The lowest region of the atmosphere is ____.

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The atmosphere is split into four spheres. Troposphere - 0 to 11 km from the earth Stratosphere - 11 to 50 km from the earth Meso sphere - 50 to 85 km from the earth Thermosphere - 85 to 500 km from the earth Hence, Troposhpere is the lowest region of atmosphere, as it is nearer to earth. Meso and thermosphere are known as Ionospheres.

The pollutants released by jet planes in the atmosphere as fluorocarbons are called ____ .

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The pollutants released by the jet planes in the atmosphere as fluoro carbons are called aerosols. As the gases are thrown into the air containing moisture, they form a colloidal solution which is called as aerosol.

____ gas pollutant in the blood may induce premature baby or deformed babies in pregnant women.

Correct! Wrong!

It is carbon monoxide which binds with heamoglobin and causes deformities in the baby.

ICSE Class 9th Chemistry 8 - Atmospheric pollution MCQs
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