Chapter 33

The greenhouse effect is caused by (a) \(\mathrm{CO}\) (b) NO (c) \(\mathrm{NO}_{2}\) (d) \(\mathrm{CO}_{2}\)

Surface water contains (a) only salt (b) organic matter (c) salt and organic matter (d) suspended impurity

An object is located at a height of \(5 \mathrm{~km}\) from the surface of the earth. The object is located in which part of atmosphere? (a) thermosphere (b) mesosphere (c) stratosphere (d) troposphere

Among the following, all except which causes pollution? (a) nuclear power plant (b) thermal power plant (c) hydro-electric plant (d) automobiles

Which factor among the following is the most harmful for life on the globe? (a) soil erosion (b) nuclear fall out (c) increasing desert (d) deforestation

Which air pollutant is not released by automobiles? (a) fly ash (b) CO (c) \(\mathrm{SO}_{2}\) (d) hydrocarbons

Taj Mahal is threatened due to the effect of (a) hydrogen (b) oxygen (c) chlorine (d) sulphur dioxide

Photochemical oxidants such as PAN and PBN are formed (a) by the action of hydrogen sulphide on hydrocarbons in the presence of sunlight (b) by the action of carbon dioxide on hydrocarbons in the presence of sunlight (c) by the action of nitrogen oxides on hydrocarbons in the presence of sunlight (d) none of these

Which of the following statements are true? (1) London smog is oxidizing in nature. (2) London smog is a mixture of smoke and fog. (3) Photochemical smog causes irritation in eyes. (4) Photochemical smog results in the formation of PAN. (a) 1,2 and 3 (b) 1,2 and 4 (c) 2,3 and 4 (d) 1,3 and 4

Which of the following statements are correct? (1) Ammonia acts as a sink for \(\mathrm{NOx}\). (2) The average residence time of \(\mathrm{NO}\) is one month. (3) SOx can be removed from flue gases by passing through a solution of citrate ions. (4) Limestone acts as a sink for SOx. (a) 1,3 and 4 (b) 1,2 and 4 (c) 2,3 and 4 (d) 1,2 and 3

Fluorocarbons are effective scavengers for ozone due to (a) photolytic production of oxides of nitrogen (b) photolytic decomposition of \(\mathrm{O}_{3}\) by \(\mathrm{Cl}\) into \(\mathrm{O}_{2}\) (c) photolytic decomposition of \(\mathrm{O}_{3}\) producing \(\mathrm{O}_{2}\) (d) photolytic reaction of \(\mathrm{O}_{2}\) producing \(\mathrm{Cl}\) radicals

Which of the following statements are true? (1) Temperature inversion is caused by smog. (2) A product of photochemical smog is PAN. (3) \(\mathrm{O}_{3}\) is involved in photochemical smog. (4) \(\mathrm{O}_{3}\) layer is destroyed by fluorocarbons. (a) 1,2 and 3 (b) 1,2 and 4 (c) 2,3 and 4 (d) 1,3 and 4

Which of the following statements are incorrect about ozone layer? 1\. it is beneficial because ozone cuts-off the ultraviolet radiation of the sun 2\. it is harmful because ozone cuts out the important radiation of the sun which are vital for photosynthesis 3\. it is harmful because ozone is dangerous to living organisms 4\. it is beneficial because oxidation reaction can proceed faster in the presence of ozone (a) 1,2 and 3 (b) 1,2 and 4 (c) 3 and 4 only (d) 2,3 and 4

About \(20 \mathrm{~km}\) above the earth there is an ozone layer. Which of the following statements about ozone and ozone layer are false? (1) The conversion of ozone to oxygen is an endothermic reaction. (2) Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun. (3) Ozone layer is harmful to us because it cuts off radiations useful for photosynthesis. (4) Ozone has a triatomic linear molecule. (a) 1,2 and 3 (b) 1,3 and 4 (c) 2,3 and 4 (d) 3 and 4 only

Ozone is formed in the upper layer of the atmosphere from oxygen by the action of (a) cosmic rays (b) ultraviolet rays (c) free radicals (d) nitrogen oxides

Pick up the incorrect statements here. (1) Classical smog is good for health but not photochemical smog. (2) During formation of smog the level of ozone in the atmosphere goes down. (3) Classical smog has an oxidizing character while the photochemical smog is reducing in character. (4) Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours. (a) 1,2 and 3 (b) 1,3 and 4 (c) 2 and 3 only (d) 3 and 4 only

Which statements are correct here? (1) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) particulates have size of \(500-1000 \mathrm{~nm}\). (2) Soot particles have a diameter of about \(5 \mathrm{~nm}\). (3) Fly ash particles have diameter of \(5 \times 10^{5} \mathrm{~nm}\). (a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1,2 and 3

Consider the following statements: (1) PAN is secondary air pollutant (2) BOD and COD values are indicators of water pollution level. Which of the statements given above is/are correct? (a) both 1 and 2 (b) 1 only (c) 2 only (d) neither 1 nor 2

Match the list I and list II and pick the correct matching from the codes given below. List (a) Peroxy acetyl nitrate (b) Polycyclic aromatic hydrocarbons (c) Dioxins (d) Indigo (e) IR active molecules (a) a \(3, \mathrm{~b} 4, \mathrm{c} 1, \mathrm{~d} 5, \mathrm{e} 2\) (b) a \(2, \mathrm{~b} 3, \mathrm{c} 5, \mathrm{~d} 4, \mathrm{e} 1\) (c) a \(5, \mathrm{~b} 3, \mathrm{c} 1, \mathrm{~d} 2, \mathrm{e} 4\) (d) a \(1, \mathrm{~b} 2, \mathrm{c} 3, \mathrm{~d} 4, \mathrm{e} 5\) List II 1\. Waste incineration 2\. Global warming 3\. Photochemical smog 4\. Carcinogens 5\. Vat dye

When rain is accompanied by a thunderstorm, the collected rain water will have a \(\mathrm{pH}\) value (a) which depends upon the amount of dust in the air (b) slightly lower than that of rain water without the thunderstorm (c) slightly higher than that when the thunderstorm is not here (d) uninfluenced by occurrence of thunderstorm

Smog is essentially caused by presence of (a) \(\mathrm{O}_{2}\) and \(\mathrm{N}_{2}\) (b) \(\mathrm{O}_{2}\) and \(\mathrm{O}_{3}\) (c) \(\mathrm{O}_{3}\) and \(\mathrm{N}_{2}\) (d) oxides of sulphur and nitrogen

Identify the wrong statements in the following: (a) Chlorofluorocarbons are responsible for ozone layer depletion (b) Green house effect is responsible for global warming. (c) Ozone layer does not permit infrared radiation from the sun to react the earth. (d) Acid rains is mostly because of oxides of nitrogen and sulphur.

What is DDT among the following- (a) Biodegradable pollutant (b) A fertilizer (c) Greenhouse gas (d) Non - biodegradabl pollutant

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was: (a) Ammonia (b) Phosgene (c) Methylisocynate (d) Methylamine

The Concentration of fluoride, Lead, nitrate and iron in a water sample from an Under ground lake was Found to be 1000 PPb 40 PPb, \(100 \mathrm{PPm}\), and \(0.2\) PPm respectively this water is unsuitable for drinking due to high Concentration of (a) Laed (b) Nitrate (c) fiuoride (d) Iron