Chemistry Practice MCQs Chapter 16 Class 12


132

Chemistry Ch 16 Class 12 ENVIRONMENTAL CHEMISTRY

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Measuring ‘Biochemical Oxygen Demand’ (ROD) is a method used for:

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Which of the following is a water cleaning halogen?

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Which one substance is used to remove both H2S and carbon dioxide from biogas?

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Which of the following is a secondary pollutant?

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Ozone Is

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Earth’s crust Is Included In which sphere?

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Which one is correct about Incineration of Industrial waste?

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Which of the following gases has least concentration in air a

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Ozone absorbs

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Which one of these Is toxic?

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Treatment of water which is very effective in killing of pathogens is:

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NO2 in atmosphere absorbs moisture to form?

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Function of ozone Is?

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Global scale SO2 is produced by

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What is the major reason for S02 emissions?

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Which of the following causes suffocation?

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The best yield of 502 can be obtained by which of the following:

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Chloro-fluoro carbons cause

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In the atmosphere, CO2 is about:

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If CO2 level increase from the normal level, what will happen?

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Which of the following pollutant decolorize the skin?

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Photochemical smog is primarily caused by

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23 / 63

Which of the following is the most environmentally-friendly source to derive energy?

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The substance for the separation of isotopes is firstly converted into the

UHS 2016
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The gas which is mainly produced in landfills from the waste is:

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Ozone concentration is measured in:

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The yellowish-brown color in photochemical smog is due to the presence of:

UHS 2013
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Aerobic decomposition of organic matter i.e. glucose by bacteria in water sediments produces

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Unpolluted rain water has a pH of:

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Which one of the following pollutants can cause death of a person by binding with
haemoglobin of red blood cells?

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Polystyrene is an additional polymer. Which one of the following structures represents
the monomer of polystyrene?

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___________ is an eye irritant.

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The pH of acid rain is

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Peroxyacetyl nitrate is an irritant to human beings and it effects:

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The suspected liver carcinogen which also has negative reproduction and developmental effect on humans is:

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The unpolluted natural rainwater is slightly acidic due to the reaction of rain water with:

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The acid rain water has pH:

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Which is the metal, whose elevated concentration is harmful to fish as it clogs the gills thus causing suffocation?

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The increase in the concentration of oxidizing agents in smog like H2O2, HNO3, PAN, and ozone in the air is called:

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The biggest source of acid rain is the oxide of

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Urea is the most widely used nitrogen fertilizer in Pakistan. Its composition is:

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About 80% of ammonia is used for the production of

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[Ti(H2O)6]3+ transmits

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Bacteria plays an important role in:

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45 / 63

Which of the following would react with ozone in the atmosphere?

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46 / 63

Percentage of nitrogen by volume in air is:

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47 / 63

Which of the following gas, when ignited, burns with a blue flame and is not very soluble in water?

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48 / 63

The essential property of a fertilizer is that is should be:

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49 / 63

Which of these pollutants is produced by burning of coal and causes acid rain.

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50 / 63

Which of the following compounds is responsible for the depletion of ozone layer?

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51 / 63

CFCs are organic compounds, that are derivatives of saturated hydrocarbons. They have high bond dissociation values therefore they are inert and non-toxic for living organisms.

The word CFCs stands for:

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52 / 63

Free Nitrogen and Oxygen are present in atmosphere but they do not react with each other under normal conditions because:

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53 / 63

Chlorofluorocarbons (CFCs) are important compounds that are used as refrigerants but these are also responsible for Ozone layer depletion. If a Chlorofluorocarbon CFCl3 is present in stratosphere, which of it’s reaction intermediates are actually responsible for the breakdown of the ozone molecule?

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54 / 63

The unit ___ is commonly used by meteorologists

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55 / 63

Which of the following is the most environmentally friendly source to derive energy?

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56 / 63

In the atmosphere, CO2is about?

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57 / 63

Which of the following is not a primary pollutant of the troposphere?

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58 / 63

What is formed by a series of complex reactions of ozone with water in the troposphere that are driven by sunlight?

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The increasing number of CFC production for industrial use has been a major contributor to the depletion of ozone molecules in the stratosphere. When CFCs diffuses slowly to the atmosphere in the presence of UV light between 175 nm to 220 nm, the ozone layer decomposes. If 1 mole of CFCl3 (Freon – 110) has been released into the air, how many moles of oxygen is produced from the photodecomposition of ozone?

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60 / 63

Which of the pair of gases is not a greenhouse gas?

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61 / 63

Which of the following is secondary pollutant?

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62 / 63

Which one of the following is NOT an advantage of synthetic fiber?

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63 / 63

The formula of “rock salt” is:

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