JEE Main
Chemistry
Environmental Chemistry
Previous Years Questions

The industrial activity held least responsible for global warming is :
How can photochemical smog be controlled?
The water quality of a pond was analyzed and its BOD was found to be 4. The pond has
Formation of photochemical smog involves the following reaction in which $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ are respectively. $$\begin{ali... The concentration of dissolved Oxygen in water for growth of fish should be more than$$\mathrm{\underline X }$$ppm and Biochemical Oxygen Demand in ... Correct statement about smog is : Some reactions of NO$$_2$$relevant to photochemical smog formation are Identify A, B, X and Y... Given below are two statements: Statement I : In polluted water values of both dissolved oxygen and$$\mathrm{BOD}$$are very low. Statement II : Eutr... Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry. Statement II... The photochemical smog does not generally contain: The acid that is believed to be mainly responsible for the damage of Taj Mahal is Correct statement about photo-chemical smog is : On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrite gives A and B while its reaction with its reaction with HCl produces B an... Given below are two Statements: Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.... The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which c... Polar stratospheric clouds facilitate the formation of : Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Polluted water may have a value o... The eutrophication of water body results in : Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.... Water sample is called cleanest on the basis of which one of the BOD values given below BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively : In stratosphere most of the ozone formation is assisted by : The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere.... Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Photochemical smog causes c... The conversion of hydroxyapatite occurs due to presence of F$$-$$ions in water. The correct formula of hydroxyapatite is : Which one of the following statements is NOT correct? Given below are two statements :Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosph... Which one of the following gases is reported to retard photosynthesis? Given below are two statements :Statement I : Non-biodegradable wastes are generated by the thermal power plants.Statement II : Bio-degradable deterge... The statements that are TRUE :(A) Methane leads to both global warming and photochemical smog(B) Methane is generated from paddy fields(C) Methane is ... Which of the following statement(s) is (are) incorrect reason for eutrophication?(A) excess usage of fertilisers(B) excess usage of detergents(C) dens... Reducing smog is a mixture of : The green house gas/es is (are) :(A) Carbon dioxide(B) Oxygen(C) Water vapour(D) MethaneChoose the most appropriate answer from the options given belo... The type of pollution that gets increased during the day time and in the presence of O3 is : The presence of ozone in troposphere: Given below are two statements :Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.Statement II : Gas... Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : Hydrogen is the most abundant elem... Given below are two statements :Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life.S... The gas released during anaerobic degradation of vegetation may lead to : The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is : The condition that indicates a polluted environment is : The processes of calcination and roasting in metallurgical industries, respectively, can Iead to : Match the following : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Ari... 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 ston... 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): Among the gases (a) – (e), the gases that cause greenhouse effect are : (a) CO2 (b) H2O (c) CFCs (d) O2 (e) O3... The primary pollutant that leads to photochemical smog is : The correct set of species responsible for the photochemical smog is : Air pollution that occurs in sunlight is : The regions of the atmosphere, where clouds form and where we live, respectively, are : The layer of atmosphere between 10 km to 50 km above the sea level is called as : Excessive release of CO2 into the atomosphere results in : The maximum prescribed concentration of copper in drinking water is: Assertion: Ozone is destroyed by CFCs in the upper stratosphere. Reason: Ozone holes increase the amount of UV radiation the earth.... Which is wrong with respect to our responsiblity as a human being to protect our environment ? The compound that is NOT a common component of photochemical smog is The molecule that has minimum /no role in the formation of photochemical smog, is - Water samples with BOD values of 4 ppm and 18 ppm, respectively are - The higher concentration of which gas in air can cause stiffness of flower buds ? Taj Mahal is being slowly disfigured and discoloured. This is primarily due to : The concentration of dissolved oxygen (DO) in cold water can go upto : Peroxyacetyl nitrate (PAN), an eye irritant is produced by : The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is : Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is Which of the following conditions in drinking water causes methemoglobinemia ? 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 uns... 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 [... Which of the following is a set of greenhouse gases ? Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal. 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 wate...
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution ?
BOD stands for :
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...
Identify the wrong statements in the following:
The smog is essentially caused by the presence of
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