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JEE Main

Environmental Chemistry

Chemistry

Previous Years Questions

MCQ (Single Correct Answer)

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Given below are two statements: Statement I : In polluted water values of both dissolved oxygen and $$\mathrm{BOD}$$ are...
JEE Main 2022 (Online) 28th July Morning Shift
The photochemical smog does not generally contain:
JEE Main 2022 (Online) 25th July Morning Shift
Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous speci...
JEE Main 2022 (Online) 24th June Evening Shift
The eutrophication of water body results in :
JEE Main 2022 (Online) 25th June Morning Shift
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Pol...
JEE Main 2022 (Online) 25th June Evening Shift
The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ...
JEE Main 2022 (Online) 26th June Evening Shift
Polar stratospheric clouds facilitate the formation of :
JEE Main 2022 (Online) 26th June Morning Shift
Given below are two Statements: Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of s...
JEE Main 2022 (Online) 27th June Morning Shift
On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrite gives A and B while its reaction with its r...
JEE Main 2022 (Online) 27th June Evening Shift
Correct statement about photo-chemical smog is :
JEE Main 2022 (Online) 28th June Evening Shift
The acid that is believed to be mainly responsible for the damage of Taj Mahal is
JEE Main 2022 (Online) 29th June Morning Shift
Water sample is called cleanest on the basis of which one of the BOD values given below
JEE Main 2021 (Online) 1st September Evening Shift
BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :
JEE Main 2021 (Online) 31st August Morning Shift
In stratosphere most of the ozone formation is assisted by :
JEE Main 2021 (Online) 27th August Evening Shift
The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by ...
JEE Main 2021 (Online) 27th August Morning Shift
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)...
JEE Main 2021 (Online) 26th August Evening Shift
Which one of the following statements is NOT correct?
JEE Main 2021 (Online) 27th July Morning Shift
Given below are two statements :Statement I : Chlorofluoro breakdown by radiation in the visible energy region and relea...
JEE Main 2021 (Online) 25th July Evening Shift
Which one of the following gases is reported to retard photosynthesis?
JEE Main 2021 (Online) 20th July Evening Shift
The statements that are TRUE :(A) Methane leads to both global warming and photochemical smog(B) Methane is generated fr...
JEE Main 2021 (Online) 18th March Morning Shift
Which of the following statement(s) is (are) incorrect reason for eutrophication?(A) excess usage of fertilisers(B) exce...
JEE Main 2021 (Online) 17th March Evening Shift
Reducing smog is a mixture of :
JEE Main 2021 (Online) 17th March Morning Shift
The green house gas/es is (are) :(A) Carbon dioxide(B) Oxygen(C) Water vapour(D) MethaneChoose the most appropriate answ...
JEE Main 2021 (Online) 16th March Evening Shift
The type of pollution that gets increased during the day time and in the presence of O3 is :
JEE Main 2021 (Online) 16th March Morning Shift
The presence of ozone in troposphere:
JEE Main 2021 (Online) 26th February Morning Shift
Given below are two statements :Statement I : An allotrope of oxygen is an important intermediate in the formation of re...
JEE Main 2021 (Online) 25th February Morning Slot
Given below are two statements :Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important ...
JEE Main 2021 (Online) 24th February Evening Slot
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : Hydr...
JEE Main 2021 (Online) 24th February Evening Slot
The gas released during anaerobic degradation of vegetation may lead to :
JEE Main 2021 (Online) 24th February Morning Slot
The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :
JEE Main 2020 (Online) 6th September Morning Slot
The condition that indicates a polluted environment is :
JEE Main 2020 (Online) 5th September Morning Slot
The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :
JEE Main 2020 (Online) 4th September Evening Slot
Match the following : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;bo...
JEE Main 2020 (Online) 4th September Morning Slot
The incorrect statement(s) among (a) – (d) regarding acid rain is (are) : (a) It can corrode water pipes. (b) It can dam...
JEE Main 2020 (Online) 3rd September Evening Slot
Thermal power plants can lead to :
JEE Main 2020 (Online) 3rd September Morning Slot
The statement that is not true about ozone is :
JEE Main 2020 (Online) 2nd September Morning Slot
Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):
JEE Main 2020 (Online) 9th January Evening Slot
Among the gases (a) – (e), the gases that cause greenhouse effect are : (a) CO2 (b) H2O (c) CFCs (d) O2 (e) O3...
JEE Main 2020 (Online) 8th January Morning Slot
The primary pollutant that leads to photochemical smog is :
JEE Main 2019 (Online) 12th April Evening Slot
The correct set of species responsible for the photochemical smog is :
JEE Main 2019 (Online) 12th April Morning Slot
Air pollution that occurs in sunlight is :
JEE Main 2019 (Online) 10th April Evening Slot
The regions of the atmosphere, where clouds form and where we live, respectively, are :
JEE Main 2019 (Online) 10th April Morning Slot
The layer of atmosphere between 10 km to 50 km above the sea level is called as :
JEE Main 2019 (Online) 9th April Evening Slot
Excessive release of CO2 into the atomosphere results in :
JEE Main 2019 (Online) 9th April Morning Slot
The maximum prescribed concentration of copper in drinking water is:
JEE Main 2019 (Online) 8th April Evening Slot
Which is wrong with respect to our responsiblity as a human being to protect our environment ?
JEE Main 2019 (Online) 8th April Morning Slot
Assertion: Ozone is destroyed by CFCs in the upper stratosphere. Reason: Ozone holes increase the amount of UV radiation...
JEE Main 2019 (Online) 8th April Morning Slot
The compound that is NOT a common component of photochemical smog is
JEE Main 2019 (Online) 12th January Evening Slot
Water samples with BOD values of 4 ppm and 18 ppm, respectively are -
JEE Main 2019 (Online) 12th January Morning Slot
The molecule that has minimum /no role in the formation of photochemical smog, is -
JEE Main 2019 (Online) 12th January Morning Slot
Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :
JEE Main 2019 (Online) 11th January Evening Slot
The higher concentration of which gas in air can cause stiffness of flower buds ?
JEE Main 2019 (Online) 11th January Evening Slot
Peroxyacetyl nitrate (PAN), an eye irritant is produced by :
JEE Main 2019 (Online) 11th January Morning Slot
The concentration of dissolved oxygen (DO) in cold water can go upto :
JEE Main 2019 (Online) 11th January Morning Slot
The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is :
JEE Main 2019 (Online) 10th January Evening Slot
Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is...
JEE Main 2019 (Online) 10th January Morning Slot
Which of the following conditions in drinking water causes methemoglobinemia ?
JEE Main 2019 (Online) 9th January Evening Slot
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 t...
JEE Main 2019 (Online) 9th January Morning Slot
The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth...
JEE Main 2018 (Offline)
Which of the following is a set of greenhouse gases ?
JEE Main 2017 (Online) 9th April Morning Slot
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal. ...
JEE Main 2017 (Online) 8th April Morning Slot
A water sample has ppm level concentration of following anions F- = 10; $$SO_4^{2-}$$ = 100; $$NO_3^-$$ = 50 The anion/a...
JEE Main 2017 (Offline)
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution ?
JEE Main 2016 (Online) 10th April Morning Slot
BOD stands for :
JEE Main 2016 (Online) 9th April Morning Slot
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 pp...
JEE Main 2016 (Offline)
Identify the wrong statements in the following:
AIEEE 2008
The smog is essentially caused by the presence of
AIEEE 2004

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