Question 1: Palette 1/21

AP-EAPCET 2025 MCQ

Which one of the following gases is the major contributor to global warming ?

A

CO

B

$\mathrm{CO}_2$

C

$\mathrm{CH}_4$

D

$\mathrm{N}_2 \mathrm{O}$

Question 2: Palette 2/21

AP-EAPCET 2025 MCQ

Which of the following statements is not correct?

A

Catalytic converters present in automobiles prevent the release of nitrogen oxide to the atmosphere.

B

Photochemical smog is a mixture of smoke, fog and $\mathrm{SO}_2$.

C

Chlorofluorocarbons damage ozone layer.

D

Acid rain corrodes water pipes resulting in the leaching of heavy metals into the drinking water.

Question 3: Palette 3/21

AP-EAPCET 2025 MCQ

The incorrect statement from the following is

A

classical smog is also called reducing smog.

B

common components of classical smog are $\mathrm{O}_3, \mathrm{NO}, \mathrm{HCHO}$.

C

photochemical smog leads to cracking of rubber and corrosion of metals.

D

photochemical smog occurs in warm, dry and sunny climate.

Question 4: Palette 4/21

AP-EAPCET 2025 MCQ

Which one of the following statements related to photochemical smog is not correct?

A

It is controlled by the use of catalytic converters in automobiles.

B

It causes corrosion of metals.

C

It is a mixture of $\mathrm{SO}_2$, smoke and fog.

D

It causes extensive damage to plant life.

Question 5: Palette 5/21

AP-EAPCET 2025 MCQ

Which of the following when present in excess in drinking water causes the disease methemoglobinemia?

A

$\mathrm{SO}_4^{2-}$

B

$\mathrm{NO}_3^{-}$

C

$\mathrm{F}^{-}$

D

Pb

Question 6: Palette 6/21

AP-EAPCET 2025 MCQ

$ \text { Match the following } $

List-I (Pollutant concentration limit in water)		List-II (Effect)
(A)	$ \mathrm{Pb}>50 \mathrm{ppm} $	(I)	Brown mottling of teeth
(B)	$ \mathrm{SO}_4^{2-}>500 \mathrm{ppm} $	(II)	'Blue baby' syndrome
(C)	$ \mathrm{NO}_3^{-}>50 \mathrm{ppm} $	(III)	Laxative effect
(D)	$ \mathrm{F}^{-}>2 \mathrm{ppm} $	(IV)	Liver damage

The correct answer is

A

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

B

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

C

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

D

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

Question 7: Palette 7/21

AP-EAPCET 2025 MCQ

Among the following compounds, which one is not responsible for the depletion of ozone layer?

A

$\mathrm{CH}_4$

B

$\mathrm{CFCl}_3$

C

NO

D

$\mathrm{Cl}_2$

Question 8: Palette 8/21

AP-EAPCET 2025 MCQ

$ \text { Match the following } $

List-I (Metal in drinking water)		List-II (Maximum prescribed concentration in ppm)
(A)	Mn	(I)	0.05
(B)	Zn	(II)	3.0
(C)	Cd	(III)	0.005
(D)	Cu	(IV)	5.0

The correct answer is

A

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

B

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

C

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

D

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

Question 9: Palette 9/21

AP-EAPCET 2025 MCQ

Identify the air pollutant which in high concentration leads to stiffness of flower buds?

A

$\mathrm{CO}_2$

B

$\mathrm{SO}_2$

C

CO

D

$\mathrm{CH}_4$

Question 10: Palette 10/21

AP-EAPCET 2025 MCQ

Consider the following.

Assertion (A) : CO is poisonous to living beings.

Reason (R) : CO binds to haemoglobin forming carboxyhaemoglobin, which is less stable than oxygen-haemoglobin complex.

Correct answer is

A

A and R both are correct and R is the correct explanation for A .

B

A and R both are correct and R is not the correct explanation for A .

C

A is correct, but R is not correct.

D

A is not correct, but R is correct.

Question 11: Palette 11/21

AP-EAPCET 2024 MCQ

Which of the following is lung irritant?

A

CO

B

$\mathrm{NO}_2$

C

$\mathrm{CO}_2$

D

$\mathrm{CH}_4$

Question 12: Palette 12/21

AP-EAPCET 2024 MCQ

Match the pollutant is List I with its maximum permissible limit in drinking water given in List II

List I		List II
A	Lead	I	500 ppm
B	Sulphate	II	50 ppm
C	Nitrate	III	50 ppb

A

$\mathrm{A}-\mathrm{II}, \mathrm{B}-\mathrm{III}, \mathrm{C}-\mathrm{I}$

B

A-II, B-I, C-III

C

A-III, B-I, C-II

D

A-III, B-II, C-I

Question 13: Palette 13/21

AP-EAPCET 2024 MCQ

Which of the following is/are estimated by tura polluted water with potassium dichromate solution in acidic medium?

$ \begin{array}{c|c|c} \hline \text { COD } & \text { BOD } & \text { DO } \\ \hline \text { I } & \text { II } & \text { III } \\ \hline \end{array} $

A

I only

B

II only

C

II and III only

D

I, II and III

Question 14: Palette 14/21

AP-EAPCET 2024 MCQ

The BOD values for pure water and highly polluted water are respectively.

A

$>5 \mathrm{ppm}, \leq 17 \mathrm{ppm}$

B

$>5 \mathrm{ppm}, \geq 17 \mathrm{ppm}$

C

$<5 \mathrm{ppm}, \geq 17 \mathrm{ppm}$

D

$<5 \mathrm{ppm}, \leq 17 \mathrm{ppm}$

Question 15: Palette 15/21

AP-EAPCET 2024 MCQ

An metal catalyst $(X)$ is used in the catalytic converter of automobiles. This prevents the release of gas $Y$ into the atmosphere. What are $X$ and $Y$ respectively?

A

$\mathrm{Pd}, \mathrm{NO}_2$

B

$\mathrm{Rh}, \mathrm{CO}_2$

C

$\mathrm{Pt}, \mathrm{N}_2$

D

$\mathrm{Ni}, \mathrm{CH}_4$

Question 16: Palette 16/21

AP-EAPCET 2024 MCQ

$ \text { Match the following. } $

List-I F-ion concentration in drinking water)		List-II (Effects on humans)
A	$ \text { <1 ppm } $	I	$ \text { Harmful to bones } $
B	$ >2 \mathrm{ppm} $	II	$ \text { Tooth decay } $
C	$ >10 \mathrm{ppm} $	III	$ \text { Brown mottling of teeth } $

$ \text { Correct answer is } $

A

A-III, B-II, C-I

B

A-III, B-I, C-II

C

A-II, B-I, C-III

D

A-II, B-III, C-I

Question 17: Palette 17/21

AP-EAPCET 2024 MCQ

Arrange the following pestidides in the chronological order of their release into the market.

Organophosphates Organochlorides Sodium chlorate

$\quad \text { (A) } \quad\quad\quad\quad\quad\quad\quad \text { (B) } \quad\quad\quad\quad \text { (C) }$

A

B, A, C

B

B, C, A

C

C, B, A

D

A, B, C

Question 18: Palette 18/21

AP-EAPCET 2021 MCQ

Identify the coldest region among the following layers of atmosphere.

A

Troposphere

B

Mesosphere

C

Stratosphere

D

Thermosphere

Question 19: Palette 19/21

AP-EAPCET 2021 MCQ

Which among the following is not a greenhouse gas?

A

Nitrous oxide

B

Water vapour

C

Sulphur dioxide

D

Methane

Question 20: Palette 20/21

AP-EAPCET 2021 MCQ

Which among the following has the highest concentration of PAN?

A

Acid rain

B

Oxidising smog

C

Reducing smog

D

Ozone

Question 21: Palette 21/21

AP-EAPCET 2021 MCQ

Green chemistry refers to reactions which

A

reduce the use and production of hazardous chemicals

B

study of the extremely slow reactions

C

are related to soil erosion

D

study of green leaves