Environmental Chemistry

01

PYQ 2010

medium

chemistry ID: mht-cet-

Pollution is

1

removal of top soil.

2

release of toxic/undesirable materials in environment.

3

conservation of energy.

4

All of the above

02

PYQ 2020

medium

chemistry ID: mht-cet-

Which among the following is a use of 2, 4-dichlorophenoxy acetic acid?

1

Antiseptic

2

Selective drug

3

Selective weed killer

4

Explosive

03

PYQ 2020

medium

chemistry ID: mht-cet-

The compound used in Holme's signals is

1

Ne

2

PH

3

H Se

4

P O

04

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following is NOT a tranquilizer?$

1

$Iproniazid$

2

$Serotonin$

3

$Veronal$

4

$Prontosil$

Official Solution

Correct Option: (4)

$Step 1: Understanding tranquilizers. Tranquilizers are chemical substances that are used to reduce mental tension, anxiety, and stress. They affect the central nervous system and help in calming the mind. Examples include antidepressants, sedatives, and mood stabilizers. Step 2: Analyzing the options. (A) Iproniazid: It is an antidepressant drug and acts as a tranquilizer by affecting brain chemicals related to mood. (B) Serotonin: It is a neurotransmitter involved in regulating mood and emotions and is associated with tranquilizing effects. (C) Veronal: It is a barbiturate and is used as a sedative and tranquilizer. (D) Prontosil: This is an antibacterial drug (a sulfa drug) used to treat bacterial infections and does not act as a tranquilizer. Step 3: Conclusion. Prontosil is not a tranquilizer as it is an antibacterial medicine, not a drug affecting mental calmness.$

05

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following is a tear gas?$

1

$COCl2$

2

$CCl2F2$

3

$ClC2H4-S-C2H4Cl$

4

$CCl3NO2$

Official Solution

Correct Option: (1)

$Step 1: Identifying tear gases. Tear gases are chemicals that cause irritation to the eyes and are commonly used in crowd control. Phosgene (COCl2) is one of the most famous tear gases, known for causing irritation in the eyes and respiratory system. Step 2: Analyzing the options. (A) COCl2: This is phosgene, a known tear gas. It is highly toxic and has been used as a chemical weapon. (B) CCl2F2: This is dichlorodifluoromethane, commonly known as Freon, which is a refrigerant and not a tear gas. (C) ClC2H4-S-C2H4Cl: This is a chemical compound that is not a tear gas. It is more associated with other industrial uses. (D) CCl3NO2: This is chloropicrin, which is used as a tear gas, but phosgene (COCl2) is the correct and more commonly recognized tear gas. Step 3: Conclusion. The correct answer is (A) COCl2, as it is phosgene, a well-known tear gas used in crowd control.$

06

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following gases is used in treatment of cancer?$

1

$He$

2

$Ar$

3

$Ne$

4

$Rn$

Official Solution

Correct Option: (4)

$Step 1: Understand medical use of noble gases. Some radioactive gases are used in medical therapy due to their ability to emit ionizing radiation that can destroy cancer cells. Step 2: Identify the radioactive noble gas. Radon () is a radioactive noble gas that emits alpha particles. These radiations are used in radiotherapy for cancer treatment. Step 3: Analyse other options. He, Ar, Ne are inert and non-radioactive, hence not used in cancer treatment. Step 4: Conclusion. Radon is used in the treatment of cancer.$

07

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following is used as disinfectant?$

1

$Bithional$

2

$Novestrol$

3

$Sulphur dioxide$

4

$Chloroxylenol$

Official Solution

Correct Option: (3)

$Step 1: Meaning of disinfectant. Disinfectants are chemical substances used to destroy microorganisms on non-living surfaces like floors, drains, and water. Step 2: Role of sulphur dioxide. Sulphur dioxide is widely used as a disinfectant and preservative due to its strong antimicrobial properties. Step 3: Analysis of other options. Bithional and Novestrol are antiseptics. Chloroxylenol is commonly used as an antiseptic (e.g., Dettol). Step 4: Conclusion. Sulphur dioxide is used as a disinfectant.$

08

PYQ 2020

medium

chemistry ID: mht-cet-

$What is the bond order of molecule?$

1

$Two$

2

$Three$

3

$Zero$

4

$One$

Official Solution

Correct Option: (3)

$Step 1: Understanding bond order. Bond order is calculated as the difference between the number of bonding electrons and antibonding electrons, divided by 2. In the case of, the molecule has a bond order of 0 because the antibonding electrons cancel out the bonding electrons. Step 2: Analyzing the options. (A) Two: Incorrect. does not have a bond order of two. (B) Three: Incorrect. has a bond order of zero, not three. (C) Zero: Correct — The bond order of is zero, indicating no bond formation. (D) One: Incorrect. Bond order of one is found in molecules like, but not in . Step 3: Conclusion. The correct answer is (C) Zero, as the bond order of is zero.$

09

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following is used as a fumigant pesticide for strawberries?$

1

$CCl F$

2

$CH Cl$

3

$CCl F$

4

$CCl$

Official Solution

Correct Option: (2)

$Step 1: Understanding fumigant pesticides. Methyl bromide and dichlorodifluoromethane (CH Cl) are common fumigant pesticides used for controlling pests on strawberries. CH Cl is often used for fumigation due to its effectiveness. Step 2: Analyzing the options. (A) CCl F : This compound is used as a refrigerant, not a fumigant pesticide. (B) CH Cl : Correct — This is used as a fumigant pesticide for strawberries. (C) CCl F: This is used as a refrigerant and is not commonly used as a fumigant pesticide. (D) CCl : Carbon tetrachloride is not commonly used as a fumigant pesticide. Step 3: Conclusion. The correct answer is (B) CH Cl, as it is used as a fumigant pesticide for strawberries.$

10

PYQ 2022

easy

chemistry ID: mht-cet-

$Which among the following statements is against to the principles of green chemistry?$

1

$Use of biodegradable polymers help to clean the environment.$

2

$Use of renewable resources ensures the sharing of resources by future generation.$

3

$Unnecessary derivatization should be minimized.$

4

$Protecting and deprotecting functional groups in organic reactions reduces the number of steps.$

Official Solution

Correct Option: (4)

$Protecting and deprotecting functional groups typically involve additional steps in organic reactions. These steps often require the use of additional reagents, solvents, and energy, leading to increased waste generation and environmental impact. Therefore, this statement goes against the principle of efficiency and minimizing unnecessary steps, making it contrary to the principles of green chemistry. So, the correct option is (D) Protecting and deprotecting functional groups in organic reactions reduces the number of steps.$

11

PYQ 2022

easy

chemistry ID: mht-cet-

$Father of green chemistry is?$

Official Solution

Correct Option: (1)

$The father of green chemistry is Dr. Paul Anastas . He is widely recognized for his contributions to the field of green chemistry and is often referred to as the "Father of Green Chemistry." Dr. Anastas co-authored the book "Green Chemistry: Theory and Practice" with John C. Warner, which laid the foundation for the principles and concepts of green chemistry. He has been instrumental in promoting the development and implementation of sustainable and environmentally friendly chemical processes.$

12

PYQ 2023

medium

chemistry ID: mht-cet-

$What causes poisoning of Carbon Monoxide?$

Official Solution

Correct Option: (1)

13

PYQ 2025

medium

chemistry ID: mht-cet-

$Which of the following has the maximum percentage of gas in the air?$

1

$Carbon dioxide$

2

$Oxygen$

3

$Hydrogen$

4

$Nitrogen$

Official Solution

Correct Option: (4)

$The Earth's atmosphere is composed of approximately 78% nitrogen, 21% oxygen, and small amounts of other gases, including carbon dioxide, argon, and others. Nitrogen is the gas that has the maximum percentage in the air.$

14

PYQ 2025

medium

chemistry ID: mht-cet-

$Which of the following gases is responsible for the greenhouse effect?$

1

$Oxygen$

2

$Carbon dioxide$

3

$Nitrogen$

4

$Hydrogen$

Official Solution

Correct Option: (2)

$Carbon dioxide (CO) is one of the major greenhouse gases responsible for trapping heat in the Earth's atmosphere, leading to the greenhouse effect. Other greenhouse gases include methane (CH), water vapor (H O), and nitrous oxide (N O). Thus, the correct answer is option (2).$

15

PYQ 2025

easy

chemistry ID: mht-cet-

$In the electrolysis of molten NaCl using inert electrodes, what will be observed at the electrodes?$

1

$Sodium deposited at anode, chlorine at cathode.$

2

$Sodium deposited at cathode, chlorine at anode.$

3

$Hydrogen gas at cathode, chlorine at anode.$

4

$Sodium deposited at anode, oxygen at cathode.$

Official Solution

Correct Option: (2)

$In the electrolysis of molten NaCl using inert electrodes, sodium metal is deposited at the cathode (reduction occurs at the cathode), and chlorine gas is evolved at the anode (oxidation occurs at the anode). The half-reactions at the electrodes are as follows: At the cathode (reduction): At the anode (oxidation): Thus, the correct observation is sodium deposited at the cathode and chlorine gas evolved at the anode.$

16

PYQ 2025

easy

chemistry ID: mht-cet-

$An aqueous solution of CuSO4 is electrolyzed using platinum electrodes. Which of the following will be observed at the cathode?$

1

$Copper metal is deposited.$

2

$Hydrogen gas is evolved.$

3

$Oxygen gas is evolved.$

4

$Copper dissolves.$

Official Solution

Correct Option: (1)

$During the electrolysis of an aqueous CuSO4 solution, copper metal is deposited at the cathode. This is because the copper ions (Cu) are reduced to copper metal (Cu) at the cathode. The half-reaction at the cathode is: At the anode, oxygen gas is evolved, but the question asks about the cathode, where copper is deposited. Hence, option (A) is the correct answer.$

17

PYQ 2025

easy

chemistry ID: mht-cet-

$A solution is formed by mixing chloroform (CHCl3) and acetone (CH3COCH3). Which of the following is true regarding the nature of this solution?$

1

$It shows positive deviation from Raoult's law due to weak intermolecular forces.$

2

$It shows negative deviation due to strong dipole-dipole interactions.$

3

$It obeys Raoult's law over the entire range of composition.$

4

$It forms an ideal solution with no enthalpy change.$

Official Solution

Correct Option: (1)

$When chloroform (CHCl3) and acetone (CH3COCH3) are mixed, they form a solution that exhibits a positive deviation from Raoult's law. This is because the intermolecular forces between the molecules of chloroform and acetone are weaker than those between similar molecules. As a result, the vapor pressure of the solution is higher than expected, indicating a positive deviation from Raoult's law.$

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Environmental Chemistry

High-Yield Trend

Chapter Questions 17 MCQs

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Chapter Questions
17 MCQs