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Year

All years 2023 2022 2021

The possibility of photochemical smog formation will be minimum at:

How can photochemical smog be controlled?

The delicate balance of $ \mathrm{CO_2} $ and $ \mathrm{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 mills	(IV) Bio-degradable wastes

Choose the correct answer from the options given below:

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

Which of the following is true about freons?

Correct statement about smog is:

The group of chemicals used as pesticide is:

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 answer from the options given below:

10.

Identify X, Y and Z in the following reaction. (Equation not balanced):

$ \text{CIO}_{} + \text{NO}_2 \rightarrow \underline{\text{X}} \xrightarrow{\text{H}_2\text{O}} \underline{\text{Y}} + \underline{\text{Z}} $

11.

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 below :

12.

Formation of photochemical smog involves the following reaction in which A, B and C are respectively.
$ (i)\; \mathrm{NO_2} \xrightarrow{h\nu} A + B $
$ (ii)\; B + \mathrm{O_2} \longrightarrow C $
$ (iii)\; A + C \longrightarrow \mathrm{NO_2} + \mathrm{O_2} $
Choose the correct answer from the options given below:

13.

The possibility of photochemical smog formation is more at.

14.

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

15.

Match List I with List II.

List I	List II
A. Nitrogen oxides in air	I. Eutrophication
B. Methane in air	II. $ \text{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 given below:

16.

Given below are two statements:
Statement I: If BOD is $ 4 \, \text{ppm} $ and dissolved oxygen is $ 8 \, \text{ppm} $, then it is a good quality water.
Statement II: If the concentration of zinc and nitrate salts are $ 5 \, \text{ppm} $ each, then it can be a good quality water.
In the light of the above statements, choose the most appropriate answer from the options given below:

17.

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

18.

Some reactions of $ \mathrm{NO_2} $ relevant to photochemical smog formation are:
Identify $ A $, $ B $, $ X $ and $ Y $.

19.

Match List-I with List-II.

List-I (Species)	List-II (Maximum allowed concentration in ppm in drinking water)
(A) $ \mathrm{F^-} $ (B) $ \mathrm{SO_4^{2-}} $ (C) $ \mathrm{NO_3^-} $ (D) $ \mathrm{Zn} $	(I). $ < 50 \, \text{ppm} $ (II). $ < 5 \, \text{ppm} $ (III). $ < 2 \, \text{ppm} $ (IV). $ < 500 \, \text{ppm} $

Choose the correct answer from the options given below:

20.

Correct statement is:

21.

The industrial activity held least responsible for global warming is:

22.

Which of the following compounds is an example of Freon?

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JEE Main 2023 30th Jan Evening Shift

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

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