Environmental Chemistry — JEE Main PYQs

The possibility of photochemical smog formation is more at

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

The delicate balance of ${\mathrm{CO}}_2$ and ${\mathrm{O}}_2$ is NOT disturbed by:

Match List-I with List-II

List-I (Industry):
(A) Steel plants
(B) Thermal power plants
(C) Fertilizer industries
(D) Paper mills

List-II (Waste Generated):
(I) Gypsum
(II) Fly ash
(III) Slag
(IV) Bio-degradable Wastes

Choose the correct answer from the options given below:

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 nitrate salts are 5 ppm each, then it can be a good quality water.
In the light of the above statements …

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. Phosphate fertilisers in water | IV. Acid rain

Choose the correct answer from the options giv …

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

Which of the following are the Green house gases?
A. Water vapour
B. Ozone
C. ${\mathrm{I}}_2$
D. Molecular hydrogen
Choose the most appropriate answer from the options given

The possibility of photochemical smog formation will be minimum at

How can photochemical smog be controlled?

Correct statement is :

Some reactions of ${\mathrm{NO}}_2$ relevant to photochemical smog formation are

Identify $\mathrm{A},\mathrm{B},\mathrm{X}$ and Y

A. Ammonium salts produce haze in atmosphere.
B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals.
C. Polychlorinated biphenyls act as cleansing solvents.
D. 'Blue baby' syndrome occurs due to the presence of excess of sulphate ions in water.

Choose the …

Correct statement about smog is

The concentration of dissolved Oxygen in water for growth of fish should be more than $\underline{\mathrm{X}}$ ppm and Biochemical Oxygen Demand in clean water should be less than $\underline{Y}$ ppm. $X$ and $Y$ in ppm are, respectively.

Formation of photochemical smog involves the following reaction in which $\mathrm{A}$, $\mathrm{B}$ and $\mathrm{C}$ are respectively.
(i) ${\mathrm{NO}}_2\stackrel{h\nu }{\to }\mathrm{A}+\mathrm{B}$
(ii) $\mathrm{B}+{\mathrm{O}}_2\to \mathrm{C}$
(iii) …

The industrial activity held least responsible for global warming is :

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

Identify $\mathrm{X},\mathrm{Y}$ and Z in the following reaction.
(Equation not balanced)
$\mathrm{ClO}+{\mathrm{NO}}_2\to \underline{\mathrm{X}}\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }\underline{\mathrm{Y}}+\underline{\mathrm{Z}}$

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 amount of dissolved oxygen.
In the light of the above statements, choose the most appropriate answer fro …

The photochemical smog does not generally contain :

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 plastic waste is lead free.
In the light of the above statements, choose the most appropriate answer from …

Correct statement about photo-chemical smog is :

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and $\mathrm{C}.\mathrm{A},\mathrm{B}$ and C are, respectively

Which amongst the following is not a pesticide?

Sulphur dioxide is one of the components of polluted air. $\mathrm{SO}{}_2$ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by $\mathrm{SO}{}_2$ is:

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 can be called as highly polluted with organic wastes, are

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

Polar stratospheric clouds facilitate the formation of :

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 smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.

In the light of above sta …

Which among the following pairs has only herbicides?

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

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 of BOD of the order of 17 ppm.

Reason R: BOD is a measure of oxygen required to oxidise both the biodegradable and non-biodegradable …

The eutrophication of water body results in :

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

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): Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smo …

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

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 of BOD is 6.5 ppm .
In the light of the above statements, choose the most appropriate answer from …

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

In stratosphere most of the ozone formation is assisted by :

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 and sulphur present in troposphere contribute to the formation of photochemical smog.
In the light of …

The water having more dissolved ${\mathrm{O}}_2$ is:

The presence of ozone in troposphere :

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and nonflammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :

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

Which one of the following statements is NOT correct?

Reducing smog is a mixture of :

Match List - I with List - II:

List - I (compound)
(a) Carbon monoxide
(b) Sulphur dioxide
(c) Polychlorinated biphenyls
(d) Oxides of nitrogen

List - II (effect / affected species)
(i) Carcinogenic
(ii) Metabolized by pyrus plants
(iii) Haemoglobin
(iv) Stiffness of flower bud …