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JEE Environmental Chemistry PYQs with Solutions

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

133 questionsChemistry2004–2023Answers + solutions

About Environmental Chemistry PYQs

Environmental Chemistry has 133 previous year questions in the Quantrex Academy JEE Main & Advanced Chemistry bank. The 133 questions in this list come from JEE Main (112) and NTA Abhyas JEE Main (21), spanning 2004 to 2023. Each question opens on its own page with the options, the correct answer and the worked solution where available.

JEE Environmental Chemistry PYQs with Solutions

About Environmental Chemistry PYQs

Questions by year (this list)

Environmental Chemistry questions with solutions

The possibility of photochemical smog formation will be minimum at

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 :

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

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

Which of the following compounds is an example of Freon?

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

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

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

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

Match List I with List II List-I Species List-2 Maximum allowed concentration in ppm in drinking water A F ^ - I B SO _ 4 ^ 2 - II C NO _ 3 ^ - III D Zn IV Choose the correct

The group of chemicals used as pesticide is

The possibility of photochemical smog formation is more at

The industrial activity held least responsible for global warming is :

How can photochemical smog be controlled?

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

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

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 + O _ 2 Choose

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 and

Correct statement about smog is

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

Which of the following is true about freons?

Which among the following pairs has only herbicides?

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

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

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

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

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

The photochemical smog does not generally contain

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 _

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

Correct statement about photo-chemical smog is

Which amongst the following is not a pesticide?

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

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

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 17ppm . Reason

The eutrophication of water body results in

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

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

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

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

In stratosphere most of the ozone formation is assisted by :

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

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

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

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

Which one of the following statements is NOT correct?

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

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

The water having more dissolved O _ 2 is :

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

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

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

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

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

Reducing smog is a mixture of:

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:

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

The presence of ozone in troposphere:

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

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

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

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

The condition that indicates a polluted environment is:

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

The incorrect statement(s) among (a) &ndash; (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

Thermal power plants can lead to :

The statement that is not true about ozone is :

Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm ):

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

Among the gases (a) - (e), the gases that cause greenhouse effect are: (a) CO _ 2 (b) H _ 2 O (c)CFCs (d) O _ 2 (e) O _ 3

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

Which of the following compounds is not an antacid?

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

Which of the following is a sink for CO?

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

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

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

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

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