MDCAT Chemistry Chapter 22 Online Test With Answers

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MDCAT Chemistry Chapter 22 Online Test

Sr. # Questions Answers Choice
1 How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil by using water spray by blowing air by treating with EDTA and then flushing the heavy metal complex out of the soil by adding CaO
2 Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil diffusion convection electrophoresis chromatography
3 Soil remediation means to make it suitable for cultivation of crops to make it acidic to make it alkeline to add manure into it
4 One of the environment problem is the formation of oil slicks when oil is spilled from tankers in sea water.
Which treatment is suitable to remove oil slicks
 blow air add Na<sub>2</sub>CO<sub>3</sub> use a specially made sorbent having fluorine trapped in it Use a sorbent having Al<sub>2</sub>O<sub>3</sub>trapped in it
5 Ecology is a science of environment and deals specially with stratosphere biosphere lithosphere hydrosphere
6 Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic. It attaches to sulphur of the disulphide link Hg is a heavy metal Hg is liquid at room temperature Hg is non reactive chemically
7 To purify water which has mud dissolved in it, a substance which coagulates the suspended particles is used.
The coagulant may be
 Ag<sup>+</sup> Cu<sup>2+</sup> Al<sup>3+</sup> Si<sup>4+</sup>
8 Water which his considered to be safe for human consumption is known as distilled water contaminated water potable water rain water
9 Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution live stock waste agricultural pesticides oil beaks and spills all of the above
10 Which is not the condition for the formation of smog there must be sufficient NO gas there must be sunlight to help photo chemical reactions to take place air must be blowing swifty there must be SO<sub>2</sub>in the air
11 Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water SO<sub>2</sub> NO<sub>2</sub> CO a and b only
12 The pH of the rain water in areas where acid rain is the cause of pollution may be 6.5 5.6 4.5 2.2
13 NO and NO2gases in atmosphere are represented by NO NO<sub>4</sub> NO<sub>x</sub> N<sub>x</sub>O<sub>y</sub>
14 Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as environment hydrosphere pollutant biosphere
15 The largest item which is recycled is newspaper plastic aluminium oil
16 In water the most important oxidizing agent is dissolved molecular oxygen which ranges form 2 - 4 ppm 4 - 6 ppm 2 - 5 ppm 4 - 8 ppm
17 The toxic organic compounds and heavy metals and metalloids results in contamination of surface water ground water both surface and ground water neither surface nor ground waters
18 Polycyclic aromatic hydrocarbons are taught to be Disinfectant Carcinogenic Helpful Reactive
19 Which of the following human activities are contaminating surface and ground waters? pesticides septic ranks petroleum and natural gas production all of these
20 When chlorofluoro carbon are subjected to U.V they form Cations Aninons Free radicals None of these
21 Ozone in most of the tropical regions acts as a pollutant and cause damages to eyes aggravates asthma chest discomfort all of these
22 The normal amount of overhead ozone is about 250 Du 300 DU 350 DU 400 DU
23 The amount of Si in the lithosphere is about 27.72% 30.35% 35.30% 40.21%<br>
24 The amount of oxygen in the lithosphere is about 35.50% 40.60% 46.60% 50.50%
25 In the atosphere, CO2is about 0.01% 0.03% 0.05% 0.09%
26 In the atmosphere, O2is about 10% 15% 21% 25%
27 The film forming components of paints are resins thinners pigments driers
28 Hydrocarbons, SO2, CO, NH3nitrogen oxides and compounds of fluorine are called Primary pollutant Secondary pollutant Tertiary pollutant None of these
29 Which gases are produced from landfills? NH<sub>3</sub> H<sub>2</sub>S N<sub>2</sub> All of these
30 In Purification of potable water the coagulant used is nickel sulpahte copper sulpahte barium sulphate alum
31 Which not a method for solid waste management> Landfill Incinerating Recycling None of these
32 Ecosystem is a smaller unit of Hydrosphere Lithosphere Biosphere Atmosphere
33 A single chlorine free radical can destroy how many ozone molecules 100 100000 10000 10
34 Which heavy metals do not have any safe limits As Hg Cr All of these
35 SO2makes ___________ acid rains carbonic acid Sulfuric Nitric acid All of these
36 The pH rain of acid rain is 8 - 7 7 - 6.5 6.5 - 6 less than 5
37 Which of the following waster material is not recycled for use again paper plastic hides of animals glass
38 In incinerating the waste is burnt at 1000<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 2000<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 1500<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
39 Chromium (VI) is highly toxic and can cause Blindness Cancer Liver problems Blood problems
40 Industrial effluents have toxic synthetic organic compounds as well as heavy metals like Pb Cr Hg All of these
41 Which step is unnecessary for purification of water for drinking purposes aeration coagulation treatment with chlorine treatment with iodine
42 Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water low value higher value both values none of these
43 Exposure to CO results in Headche Fatigue Unconsciousness All of these
44 Which gas is not a constituent of atmosphere? Xe O<sub>3</sub> H<sub>2</sub> F<sub>2</sub>
45 Surface and ground water sources are contaminated by various human activities which of the followings is not a human activity that causes contamination in fresh water live stock waste oil leaks and spills disposal of industrial effluents rain
46 CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy 10,000 20,000 100,000 50,000
47 Which is not the affect of polluted air on environment acid rain smog ozone global warming
48 Which one of the following is not air pollutant gas CO CO<sub>2</sub> NO SO<sub>2</sub>
49 Which factor is helping to reduce the environment pollution rapid growth population urbanization idustrialization increase of plantation
50 A pollutant affects Human affects Quality of life Functioning of ecosystem All of these
51 The 95.5% mass of Lithoshone is made of 11 elements i,e O2, Si, Al, Fe, Ca, Na, K, Mg, Ti, H2and P. Which element is present in trace amount iodine bromine lead carbon
52 The region of earth capable of supporting life is Hydrosphere Lithosphere Biosphere Atmosphere
53 Oceans cove ____________ percent of the surface of the earth 60 70 80 97
54 The % of CO2in the atmosphere is 3.0% 0.03% 0.3% 0.5%
55 Which is not a component of environment? Biosphere Lithosphere Hydrosphere None of these
56 Which one of the following is used as coagulant for purification potable water Copper sulphate Alum Barium sulphate Nickel sulphate
57 Chose a point which is not included in the components of environment Stratosphere Hydrosphere Lithosphere Biosphere
58 Lithosphere has amount of silicon 35.30% 27.72% 40.01% 21.13%
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