Environmental Chemistry

NEET Chemistry · 96 questions · Page 3 of 10 · Click an option or "Show Solution" to reveal answer

Q21

Reducing smog is a mixture of :

A Smoke, fog and O3

B Smoke, fog and N2O3

C Smoke, fog and CH2 = CH

-

CHO

D Smoke, fog and SO2

Correct Answer

Option D

Solution

Classical smog occurs in a cool humid climate, it is a mixture of smoke, fog, and SO2. It is known as reducing smog.

Q22

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

A CO

B CFCs

C CO2

D NO2

Correct Answer

Option D

Solution

According to NCERT only NO2 from the given options can retard the photosynthesis process in plants.

Q23

Which one of the following is used to remove most of plutonium from spent nuclear fuel?

A ClF3

B O2F2

C I2O5

D BrO3

Correct Answer

Option B

Solution

O2F2 oxidizes plutonium to PuF6 and the reaction is used in removing plutonium as PuF6 from spent nuclear fuel.

Q24

The eutrophication of water body results in :

A loss of Biodiversity.

B breakdown of organic matter.

C increase in biodiversity.

D decrease in BOD.

Correct Answer

Option A

Solution

Eutrophication is the process in which nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity.

Q25

Match List I with List II .tg .tg 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 given below :

A A-II, B-III, C-I, D-IV

B A-I, B-II, C-III, D-IV

C A-IV, B-II, C-III, D-I

D A-IV, B-III, C-II, D-I

Correct Answer

Option D

Solution

Let's match the items in List I with the items in List II: A.

Nitrogen oxides in air - These are responsible for acid rain.

So, A-IV.

Methane in air - Methane is a greenhouse gas, contributing to global warming.

So, B-III.

Carbon dioxide - Normal rain water has a pH of 5.6 (slightly acidic).

This is because it is exposed to the carbon dioxide in the atmosphere.

So, C-II.

Phosphate fertilizers in water - These contribute to eutrophication.

So, D-I.

Therefore, the correct answer is: A-IV, B-III, C-II, D-I

Q26

Match with .tg .tg Industry Waste Generated

List - I		List - II
(A)	Steel plants	(I)	Gypsum
(B)	Thermal power plants	(II)	Fly ash
(C)	Fertilizer industries	(III)	Slag
(D)	Paper mills	(IV)	Bio-degradable wastes

A (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

B (A)-(III), (B)-(IV), (C)-(I), (D)-(II)

C (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

D (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

Correct Answer

Option A

Solution

A - Steel plants : They generate waste in the form of slag (III), which is a by-product of the smelting process used in steel production.

B - Thermal power plants : These plants generate fly ash (II) as a by-product of coal combustion.

C - Fertilizer industries : The manufacture of phosphate fertilizers can produce gypsum (I) as a waste product.

D - Paper mills : They generate bio-degradable wastes (IV) as a result of the pulp and papermaking processes.

Therefore, the correct option is A : (A)-(III), (B)-(II), (C)-(I), (D)-(IV).

Q27

The delicate balance of

\mathrm{CO}_{2}

and

\mathrm{O}_{2}

is NOT disturbed by :

A Burning of Coal

B Burning of petroleum

C Respiration

D Deforestation

Correct Answer

Option C

Solution

The delicate balance of $\mathrm{CO}_2$ and $\mathrm{O}_2$ is disturbed by the burning of coal (Option A), the burning of petroleum (Option B), and deforestation (Option D).

These activities contribute to the increase in atmospheric $\mathrm{CO}_2$ levels, which can lead to global warming and climate change.

However, respiration (Option C) does not disturb the delicate balance of $\mathrm{CO}_2$ and $\mathrm{O}_2$ .

During respiration, organisms including humans and animals consume $\mathrm{O}_2$ and produce $\mathrm{CO}_2$ as a byproduct.

This $\mathrm{CO}_2$ can be utilized by plants during photosynthesis to produce $\mathrm{O}_2$ , thus maintaining a balance between $\mathrm{CO}_2$ and $\mathrm{O}_2$ levels in the atmosphere.

Q28

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 water bodies (D) lack of nutrients in water bodies that prevent plant growth Choose the most appropriate answer from the options given below :

A (A) Only

B (B) and (D) only

C (C) only

D (D) only

Correct Answer

Option D

Solution

Nutrient enriched water bodies support dense plant populations.

This is because of the excess usage of fertilizers and detergents.

This process is known as eutrophication.

Q29

The type of pollution that gets increased during the day time and in the presence of O3 is :

A Oxidising smog

B Global warming

C Acid rain

D Reducing smog

Correct Answer

Option A

Solution

Photochemical smog occurs in warm, dry, and sunny climates.

It is also called oxidizing smog.

The main components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde, and PAN.

Q30

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 the options given below :

A Both Statement I and Statement II are correct

B Both Statement I and Statement II are incorrect

C Statement I is correct but Statement II is incorrect

D Statement I is incorrect but Statement II is correct

Correct Answer

Option A

Solution

Both Statement are correct. - Fuel obtained from plastic waste has high octane rating.

It contain no lead and is known as "green fuel". - The non bio-degradable fly ash and slag from steel industry can be used by cement industry.

Ready for a full NEET mock test? Timed · full syllabus · instant results

Take a Mock Test →