JEE Chemistry Environmental Chemistry MCQs Set B

Question: Water pollution is caused by

• a) pesticides
• b) auto exhausts
• c) fly ash
• d) aeroplanes

Answer: pesticides

Question: Which causes death of fishes in water bodies polluted by sewage?

• a) Decrease in D.O.
• b) Pathogens
• c) Foul smell
• d) Clogging of gills by silt

Answer: Decrease in D.O.

Question: Chief source of soil and water pollution is

• a) All of the above
• b) agro industry
• c) mining
• d) thermal power plant

Answer: All of the above

Question: What is DDT among the following ?

• a) Non-biodegradable pollutant
• b) Biodegradable pollutant
• c) A fertilizer
• d) Greenhouse gas

Answer: Non-biodegradable pollutant

Question: The quantity of DDT in food chain

• a) increases
• b) changes
• c) decreases
• d) remains same

Answer: increases

Question: The effect of polluted water on soil is, that

• a) all of the above
• b) it renders soil acidic or basic
• c) it contaminates ground water
• d) it decreases fertility

Answer: all of the above

Question: Soil is polluted by

I. pesticides
II. synthetic fertilizers
III. green manure
Choose the correct option.

• a) I and II
• b) I, II and III
• c) I and III
• d) II and III

Answer: I and II

Question: Which of the following trophic level has least concentration of toxins deposition ?

• a) Aquatic plant
• b) Human being
• c) Small fish
• d) Largest fish

Answer: Aquatic plant

Question: Green chemistry means such reactions which

• a) reduce the use and production of hazardous chemicals
• b) are related to the depletion of ozone layer
• c) study the reactions in plants
• d) produce colour during reactions

Answer: reduce the use and production of hazardous chemicals

Question:  Which of the following practices will not come under green chemistry?

• a) Using plastic cans for neatly storing substances
• b) Using bicycle for travelling small distances instead of using petrol/ diesel based vehicles
• c) Using H₂O₂ for bleaching purpose instead of using chlorine based bleaching agents
• d) If possible, making use of soap made of vegetable oils instead of using synthetic detergents

Answer: Using plastic cans for neatly storing substances

Question: “Reducing potentially hazardous waste through smarter production”. This represents a great step forward for

• a) green chemistry
• b) green biotechnology
• c) green revolution
• d) industrial revolution

Answer: green chemistry

Question:  Use of which of the following solvent in dry cleaning will result in less harm to ground water ?

• a) Liquid CO₂
• b) None of these
• c) H₂O₂
• d) None of these

Answer: Liquid CO₂

Question: Synthesis of ethanal commercially from which of the following reagent is the part of green chemistry ?

• a) CH₂ = CH₂
• b) All of these
• c) CH₃ CH₂OH
• d) None of these

Answer: CH₂ = CH₂

Question: Which of the following sequence of T and F is correct for given statements. Here T stands for True statement and F stands for False statement.

(i) Troposphere is the lowest region of atmosphere in which the human beings along with other organisms live.
(ii) Troposphere extends up to the height of 10 km from sea level.
(iii) Stratosphere lies above troposphere, between 10 and 20 km above sea level.
(iv) Troposphere contains much little water vapour, dinitrogen, dioxygen and ozone
(v) Stratosphere contains ozone, and cloud formation also takes place in this region.

• a) TTFFF
• b) TFTFT
• c) TFTFF
• d) TTTTT

Answer: TTFFF

Question: Which of the following statement(s) is / are correct ?

(i) Sulphuric acid, nitric acid as well as ammonium salts are components of acid rain.
(ii) Formation of acid rain can be reduced by using less sulphur content fossil fuels for power plants and industries.
(iii) Catalytic converters must be used in cars to reduce the harmful effect of exhaust.
(iv) Main component of catalytic converter is ceramic honey comb coated with metals like – Au, Ag, Pt etc.

• a) (i), (ii), (iii) and (iv)
• b) (ii) and (iii)
• c) (i), (ii) and (iii)
• d) (ii), (iii) and (iv)

Answer: (i), (ii), (iii) and (iv)

Question: Which of the following statement(s) is/are correct ?

(i) Classical smog is a mixture of smoke, fog and sulphur dioxide.
(ii) Classical smog is also called oxidising smog
(iii) Hydrocarbons, NO₂ and PAN are components of photochemical smog.

• a) (i) and (iii)
• b) (i) and (ii)
• c) (i), (ii) and (iii)
• d) (iii) only

Answer: (i) and (iii)

Question: Which of the following statements are not correct?

(i) F^– ion concentration above 2ppm causes brown mottling in teeth.
(ii) Excessive F^– (over 10 ppm) causes harmful effect to bones and teeth.
(iii) Excessive lead in drinking water causes disease methemoglobinemia
(iv) Deficiency of sulphate in drinking water causes laxative effect.

• a) (iii) and (iv)
• b) (ii) and (iii)
• c) (ii) and (iv)
• d) (ii), (iii) and (iv)

Answer: (iii) and (iv)

Question: Which of the following statement(s) is/are true about waste recycling ?

(i) Clothes can be made from recycled plastic waste.

(ii) Fuel that has high octane rating and contains no lead can be obtained from plastic waste.

iii) Technology has now been developed to produce electricity from the garbage

• a)  All of these
• b) (ii) and (iii)
• c) (ii) only
• d) (ii) only

Answer: All of these

Question:

• a) A – (s), B – (p), C – (r), D – (q)
• b) A – (p), B – (s), C – (q), D – (r)
• c) A – (p), B – (q), C – (r), D – (s)
• d) A – (s), B – (s), C – (q), D – (p)

Answer: A – (s), B – (p), C – (r), D – (q)

Question:

• a) A – (r, s), B – (t, s), C – (q), D – (p)
• b) A – (r), B – (s), C – (q), D – (p)
• c) A – (t,s), B – (s), C – (q), D – (r)
• d) A – (r), B – (t), C – (q), D – (p)

Answer: A – (r, s), B – (t, s), C – (q), D – (p)

Question:

• a) A – (s), B – (t), C – (p), D – (r), E – (q)
• b) A – (t), B – (p), C – (r), D – (s), E – (q)
• c) A – (s), B – (q), C – (p), D – (t), E – (r)
• d) A – (q), B – (s), C – (t), D – (r), E – (p)

Answer: A – (s), B – (t), C – (p), D – (r), E – (q)

Question:

• a) A – (r), B – (s), C – (t), D – (p), E – (q)
• b) A – (t), B – (p), C – (r), D – (s), E – (q)
• c) A – (s), B – (t), C – (p), D – (q), E – (r)
• d) A – (p), B – (r), C – (s), D – (t), E – (q)

Answer: A – (r), B – (s), C – (t), D – (p), E – (q)

Question:

• a) A – (p,s), B – (r), C – (p), D – (q)
• b) A – (p), B – (s), C – (r), D – (q)
• c) A – (s), B – (r), C – (q), D – (p)
• d) A – (p), B – (q), C – (s), D – (r)

Answer: A – (p,s), B – (r), C – (p), D – (q)

Question:

Assertion : Uncatalysed oxidation of sulphur dioxide is a slow process.
Reason : Particulate matter in polluted air catalyses the oxidation of sulphur dioxide.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : Dinitrogen and dioxygen do not react with each other at a normal temperature.
Reason : At high altitudes dinitrogen combines with dioxygen to form oxides of nitrogen

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

Assertion : Green house effect was observed in houses used to grow plants and these are made of green glass.
Reason : Green house name has been given because glass houses are made of green glass.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : CO₂ causes green house effect.
Reason : Other gases do not show such effect

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : The pH of acid rain is less than 5.6.
Reason : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

Assertion : Photochemical smog is oxidising in nature.
Reason : Photochemical smog contains NO₂ and O₃, which are formed during the sequence of reactions.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : Carbon dioxide is one of the important greenhouse gases.
Reason : It is largely produced by respiratory function of animals and plants.

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

Assertion : Suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason : Catalytic converters greatly reduce pollution caused by automobiles.

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

Assertion : Ozone is destroyed by solar radiation in upper stratosphere.
Reason : Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth

• a) Assertion is incorrect, reason is correct.
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer: Assertion is incorrect, reason is correct.

Question:

Assertion : Excessive use of chlorinated synthetic pesticides causes soil and water pollution.
Reason : Such pesticides are non-biodegradables

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question: 

Assertion : If BOD level of water in a reservoir is less than 5 ppm it is highly polluted.
Reason : High biological oxygen demand means low activity of bacteria in water.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : Eutrophication shows increase in productivity in water.
Reason : With increasing eutrophication, the diversity of the phytoplankton increases.

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question: In which of the following regions hydrogen and helium are found ?

• a) Exosphere
• b) Stratosphere
• c) Mesosphere
• d) Troposphere

Answer: Exosphere

Question: Which one of the following pairs is mismatched ?

• a) Solar energy - Greenhouse effect
• b) Nuclear power - radioactive wastes
• c) Biomass burning - release of CO₂
• d) None of these

Answer: Solar energy - Greenhouse effect

Question: Which of the following acts as a sink for CO?

• a) Microorganisms present in the soil
• b) Oceans
• c) Haemoglobin
• d) Plants

Answer: Microorganisms present in the soil

Question: How many time oxyhaemoglobin is less stable than carboxyhaemoglobin?

• a) 300
• b) 200
• c) 50
• d) 500

Answer: 300

Question: Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because __________.

• a) the reaction is endothermic and requires very high temperature
• b) the reaction can be initiated only in presence of a catalyst.
• c) oxides of nitrogen are unstable
• d) None of these

Answer: the reaction is endothermic and requires very high temperature

Question: SO₂ is one of the air pollutants. SO₂

• a) both
• b) dissolves in water to form acid rain
• c) is a lung irritant
• d) None of these

Answer: both

Question: The greatest affinity for haemoglobin is shown by which of the following

• a) NO
• b) O₂
• c) CO
• d) CO₂

Answer: NO

Question: Which pollutant is harmful for ‘Taj Mahal’?

• a) SO₂
• b) Hydrogen
• c) O₂
• d) Chlorine

Answer: SO₂

Question: The beauty of Taj Mahal is endangered due to

• a) air pollutants released from oil refinery
• b) discharge of industrial waste in Yamuna river
• c) degradation of marble due to high temperature
• d) riparian erosion

Answer: air pollutants released from oil refinery

Question: Acid rain is caused by or recent reports of acid rain in some industrial cities are due to the effect of atmospheric pollution by

• a) excessive release of NO₂ and SO₂ in atmosphere by burning of fossil fuel
• b) excessive release of NH₃ by industrial plants and coal gas
• c) excessive release of CO in atmosphere by incomplete combustion of coke, charcoal and other carbonaceous fuel in paucity of oxygen.
• d) None of these

Answer: excessive release of NO₂ and SO₂ in atmosphere by burning of fossil fuel

Question: Which of the following is the major cause of global warming?

• a) re-radiation of I.R. rays by CO₂ and H₂O
• b) re-radiation of I.R. rays by O₂ and N₂
• c) re-radiation of U.V. rays by CO₂ and H₂O
• d) None of these

Answer: re-radiation of I.R. rays by CO₂ and H₂O

Question: Formation of London smog takes place in

• a) winter during morning time
• b) summer during morning time
• c) summer during day time
• d) winter during day time

Answer: winter during morning time

Question: The false statement among the followings

• a) The average residence time of NO is one month
• b) Limestone acts as a sink for SO_x
• c) Ammonia acts as a sink for NO_x
• d) None of these

Answer: The average residence time of NO is one month

Question: Which of the following statements about polar stratosphere clouds (PSCs) is not correct?

• a) PSCs do not react with chlorine nitrate and HCl
• b) Type I clouds are formed at about –77ºC and contain solid HNO₃ . 3H₂O
• c) Both
• d) None of these

Answer:  PSCs do not react with chlorine nitrate and HCl

Question: Which of the following is/are formed when ozone reacts with the unburnt hydrocarbons in polluted air ?

(i) Formaldehyde             (ii) Acrolein
(iii) Peroxyacetyl nitrate  (iv) Formic acid

• a) (i), (ii) and (iii)
• b) (ii) only
• c) (i) and (iv)
• d) (iii) only

Answer: (i), (ii) and (iii)

Question: Thermal pollution affects mainly

• a) aquatic creature
• b) air
• c) vegetation
• d) rocks

Answer: aquatic creature

Question:  A dental disease characterised by mottling of teeth is due to presence of a certain chemical element in drinking water. Which is that element?

• a) Fluorine
• b) Boron
• c) Chlorine
• d) Mercury

Answer: Fluorine

Question: Frequent occurrence of water blooms in a lake indicates

• a) oxygen deficiency
• b) excessive nutrient availability
• c) absence of herbivores in the lake
• d) nutrient deficiency

Answer: oxygen deficiency

Question: Which one of the following statements is correct ?

• a) Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
• b) Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
• c) Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil
• d) At present it is not possible to grow maize without chemical fertilizers

Answer:  Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

Question: Lichens do not like to grow in cities

• a) because of SO₂ pollution
• b) because natural habitat is missing
• c) because of lack of moisture
• d) because of absence of the right type of algae and fungi

Answer: because of SO₂ pollution

Question: BOD of pond is connected with

• a) microbes & organic matter
• b) organic matter
• c) microbes
• d) None of these

Answer: microbes & organic matter

Question: Which is known as ‘Third poison of environment’ and also creates ‘Blue baby syndrome

• a) Phosphate and detergents found in water
• b) Nitrate present in water
• c) Cynide
• d) Pesticides

Answer: Phosphate and detergents found in water

Question:  Negative soil pollution is

• a) reduction in soil productivity due to erosion and over use
• b) reduction in soil productivity due to addition of pesticides and industrial wastes
• c) converting fertile land into barren land by dumping ash, sludge and garbage
• d) None of the above

Answer: reduction in soil productivity due to erosion and over use