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Environmental Chemistry — JEE Main & Advanced Chemistry PYQs

133 previous year questions from Environmental Chemistry with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

133 questionsChemistrySolutions on every page
1

The possibility of photochemical smog formation will be minimum at

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Which of the following are the Green house gases? A. Water vapour B.Ozone C. I 2 D.Molecular hydrogen Choose the most appropriate answer from the options given below :

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The radical which mainly causes ozone depletion in the presence of UV radiations is :

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Match List I with List II List I List II A Nitrogen oxides in air I Eutrophication B Methane in air II pH of rain water becomes 5 . 6 C Carbon dioxide III Global warming D Phosphat

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Which of the following compounds is an example of Freon?

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Given below are two statements : Statement-I : If BOD is 4 ppm and dissolved oxygen is 8 ppm , then it is a good quality water. Statement-II : If the concentration of zinc and nitr

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The delicate balance of CO 2 and O 2 is NOT disturbed by

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Match List I with List II List I Industry List II Waste Generated (A) Steel plants (I) Gypsum (B) Thermal power plants (II) Fly ash (C) Fertilizer Industries (III) Slag (D) Paper m

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Which of these reactions is not a part of breakdown of ozone in stratosphere?

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Match List I with List II List-I Species List-2 Maximum allowed concentration in ppm in drinking water A F - I < 50 ppm B SO 4 2 - II < 5 ppm C NO 3 - III < 2 ppm D Zn

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The group of chemicals used as pesticide is

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The possibility of photochemical smog formation is more at

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The industrial activity held least responsible for global warming is :

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How can photochemical smog be controlled?

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The normal rain water is slightly acidic and its pH value is 5 . 6 because of which one of the following ?

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The water quality of a pond was analysed and its BOD was found to be 4 . The pond has

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Formation of photochemical smog involves the following reaction in which A , B and C are respectively. (i) NO 2 ⟶ hu A + B (ii) B + O 2 → C (iii) A + C → NO 2 +

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The concentration of dissolved Oxygen in water for growth of fish should be more than X ¯ ppm and Biochemical Oxygen Demand in clean water should be less than Y ¯ ppm . X

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Correct statement about smog is

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Some reactions of NO 2 relevant to photochemical smog formation are Identify A , B , X and Y

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Which of the following is true about freons?

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Which among the following pairs has only herbicides?

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Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II : Eutrophication results in decrease in the amou

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Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry. Statement II : The fuel obtained from plas

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Match List I with List II List-I Pollutant List-II Disease /sickness A Sulphate > 500 ppm I Methemoglobinemia B Nitrate > 50 ppm II Brown mottling of teeth C Lead > 50

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Match List I with List II List-I Pollutant List-II Source A Microorganisms I Strip mining B Plant nutrients II Domestic sewage C Toxic heavy metals III Chemical fertilizer D Sedime

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Match List I with List II. List-I List-II A Sulphate I Pesticide B Fluoride II Bending of bones C Nicotine III Laxative effect D Sodium arsinite IV Herbicide Choose the correct ans

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The photochemical smog does not generally contain

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Sulphur dioxide is one of the components of polluted air. SO 2 is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO 2 is

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The acid that is believed to be mainly responsible for the damage of Taj Mahal is

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Correct statement about photo-chemical smog is

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Which amongst the following is not a pesticide?

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Given below are two Statements : Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide. Statement II : Photochemical

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The measured BOD values tor four difterent water samples A - D are as tollows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly pollute

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Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: Polluted water may have a value of BOD of the order of 17 ppm . Reason:

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The eutrophication of water body results in

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Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

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Water sample is called cleanest on the basis of which one of the BOD values given below :

JEE Main 2021 Solution View → 39

The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

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BOD values (in ppm ) for clean water (A) and polluted water (B) are expected respectively as:

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In stratosphere most of the ozone formation is assisted by :

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The gas ' A ' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV -radiations in stratosphere. The intermediates formed i

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason ( R ) Assertion (A) : Photochemical smog causes cracking of rubber. Reason (R)

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The conversion of hydroxyapatite occurs due to presence of F - ions in water. The correct formula of hydroxyapatite is:

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Match List - I with List - II : List - I (compound) List - II (effect/affected species) a Carbon monoxide i Carcinogenic b Sulphur dioxide ii Metabolized by pyrus plants c Polychlo

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Which one of the following statements is NOT correct?

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Given below are two statements : Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts

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Which one of the following chemical agent is not being used for dry-cleaning of clothes?

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The water having more dissolved O 2 is :

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Which one of the following gases is reported to retard photosynthesis?

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Green chemistry in day-to-day life is in the use of:

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Given below are two statements : Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II : Bio-degradable detergents leads to eutrophication.

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The satements that are TRUE: (A) Methane leads to both global warming and photochemical smog (B) Methane is generated from paddy fields (C) Methane is a stronger global warming gas

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Which of the following statement(s) is (are) incorrect reason for eutrophication? (A) excess usage of fertilisers (B) excess usage of detergents (C) dense plant population in water

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Reducing smog is a mixture of:

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The green house gas/es is (are): (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the options given below:

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The type of pollution that gets increased during the daytime and in the presence of O 3 is :

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The presence of ozone in troposphere:

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Given below are two statements: Statement I: The pH of rain water is normally ~ 5 . 6 . Statement II : If the pH of rain water drops below 5 . 6 , it is called acid rain. In the li

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Given below are two statements: Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen

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Given below are two statements: Statement I: The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life. Statement II: The optimum value

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The gas released during anaerobic degradation of vegetation may lead to:

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The condition that indicates a polluted environment is:

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The processes of calcination and roasting in metallurgical industries, respectively, can lead to :

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The incorrect statement(s) among (a) – (d) regarding acid rain is (are): a) It can corrode water pipes (b) It can damage structures made up of stone. (c) It cannot cause resp

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Thermal power plants can lead to :

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The statement that is not true about ozone is :

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Biochemical Oxygen Demand B O D is the amount of oxygen required (in p p m ):

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10.30 m g of O 2 is dissolved into a liter of sea water of density 1.03 g / m L . The concentration of O 2 in ppm is _____________.

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Among the gases a - e , the gases that cause greenhouse effect are: a C O 2 b H 2 O c C F C s d O 2 e O 3

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The number of greenhouse gases in the following is ________. CO 2 , O 2 , N 2 O , CH 4 , CFCs , CO , H 2 O g , O 3

NTA Abhyas JEE Main 2020 Solution View → 72

Which of the following compounds is not an antacid?

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Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

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Which of the following is a sink for CO?

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A petroleum fraction having boiling range 70 − 200 o   C and containing 6 − 10 carbon atoms per molecule is called

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How many of the following pollutants are considered as non-viable particulate pollutants? Smoke, dust, fungi, mists, moulds, algae, smog, bacteria, fumes

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Which of the following compounds is used in anti-knock compositions to prevent the deposition of oxides of lead on spark plug, combustion chamber and exhaust pipe?

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SO 2 is considered as an air pollutant because

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Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

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A water sample has ppm level concentration of following anions, F - = 10 ; S O 4 2 - = 100 ; N O 3 - = 50 . The anion/anions that make/makes the water sample unsuitable for drinkin

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Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxyacetyl nitrates (PAN) and so forth X is

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The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is

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The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [ 3 C a 3 P O 4 2 . C a O H 2 ]

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Drained sewage has B.O.D.

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Ozone depletion in the stratosphere is mainly caused by

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The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is

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Which of two water sample A & B with BOD of 10 and 20 respectively, then mark correct option

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Minamata disease is due to pollution of

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Fish die in water bodies polluted by sewage due to

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Which is the most hazardous metal pollutant of automobile exhaust

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Which of the following are common components of photochemical smog? 1 . Chlorofluorocarbons 2 . Acrolein 3 . Ozone 4 . Peroxyacetyl nitrate

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The primary pollutant that leads to photochemical smog is:

JEE Main 2019 Solution View → 93

The correct set of species responsible for the photochemical smog is:

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Air pollution that occurs in sunlight is

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The noble gas that does not occur in the atmosphere is;

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The regions of the atmosphere, where clouds form and where we live, respectively, are:

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The layer of atmosphere between 10 k m to 50 k m above the sea level is called as:

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Excessive release of C O 2 into the atmosphere results in

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The maximum prescribed concentration of copper in drinking water is:

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Which is wrong with respect to our responsibility as a human being to protect our environment?

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Assertion: Ozone is destroyed by C F C s in the upper stratosphere. Reason: Ozone holes increase the amount of U V radiation reaching the earth.

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The compound that is NOT a common component of photochemical smog is:

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The upper stratosphere consisting of the ozone layer, protects us from the sun's radiation that falls in the wavelength region of

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Water samples with B O D values of 4 ppm and 18 ppm, respectively, are:

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The molecule that has minimum or no role in the formation of photochemical smog, is:

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Taj Mahal is being slowly disfigured and discoloured. This is primarily due to

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The higher concentration of which gas in air can cause stiffnes of flower buds?

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Peroxyacetyl nitrate (PAN), an eye irritant, is produced by:

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The concentration of dissolved oxygen (DO) in cold water can go upto

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The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is

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Water filled in two glasses A and B gave BOD values of 10 and 20 , respectively. The correct statement regarding them is

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The pH of rain water is approximately:

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Which of the following conditions in drinking water causes methemoglobinemia?

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A water sample has ppm level concentration of the following metals: Fe = 0 .2 ; Mn = 5 .0 ; Cu = 3 .0 ; Zn = 5 .0 . The metal that makes the water sample unsuitable for drinking is

JEE Main 2019 Solution View → 115

Biochemical oxygen demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

JEE Main 2018 Solution View → 116

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting 3 Ca 3 PO 4 2 . Ca OH 2 to:

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Which of the following is a set of greenhouse gases?

JEE Main 2017 Solution View → 118

Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

JEE Main 2017 Solution View → 119

A water sample has ppm level concentration of following anions F - = 10 ; SO 4 2 - = 100 ; NO 3 - = 50 The anion/anions that make/makes the water sample unsuitable for drinking is/

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Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?

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