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Environmental Chemistry MCQs

Study the chemical principles affecting the environment with our expert-curated Environmental Chemistry MCQs. These multiple-choice questions cover essential topics such as water and air pollution, chemical pollutants, greenhouse gases, acid rain, ozone depletion, heavy metals, soil chemistry, environmental toxicology, chemical waste management, and green chemistry. This category is especially useful for candidates preparing for PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and for lecturer chemistry posts, environmental officer exams, and science educator roles. Also ideal for BSc/MSc Chemistry students with a focus on environmental studies.

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1 Environmental Chemistry MCQs

The rate of ozone formation in the atmosphere mainly depends on the flux of which type of radiation?

  • Visible radiation
  • Ultraviolet (UV) radiation
  • Infrared radiation
  • Gamma rays
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Correct Answer: B. Ultraviolet (UV) radiation

Explanation:

Ozone (O₃) in the atmosphere is formed mainly in the stratosphere by the ... Read More Details

2 Environmental Chemistry MCQs

The main contributor to the toxicity of detergent is:

  • Na-Silicate solution
  • Na-Sulphate solution
  • Na-Chloride solution
  • K-Chloride solution
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Correct Answer: A. Na-Silicate solution

Explanation:

Detergents are widely used for cleaning clothes, dishes, and other surfaces. However, they ... Read More Details

3 Environmental Chemistry MCQs

Which parameter measures organic pollution in water?

  • COD
  • DO
  • pH
  • Salinity
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Correct Answer: A. COD

Explanation:

Organic pollution in water happens when organic substances like sewage, food waste, or ... Read More Details

4 Environmental Chemistry MCQs

The medium which interacts with long-lived pollutants is:

  • Source
  • Receptor
  • Sink
  • All of them
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Correct Answer: C. Sink

Explanation:

Long-lived pollutants are substances that remain in the environment for many years without ... Read More Details

5 Environmental Chemistry MCQs

Cyclone collector is used for minimizing:

  • Water pollution
  • Sound pollution
  • Soil pollution
  • Air pollution
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Correct Answer: D. Air pollution

Explanation:

A cyclone collector, also called a cyclone separator, is a device used in ... Read More Details

6 Environmental Chemistry MCQs

Biodegradable pollutant is:

  • DDT
  • Mercury salt
  • Domestic waste
  • Aluminum foil
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Correct Answer: C. Domestic waste

Explanation:

Pollutants are substances that contaminate the environment and can harm living organisms. They ... Read More Details

7 Environmental Chemistry MCQs

Surface water contains:

  • Only salt
  • Organic matter
  • Salt & Organic matter
  • Suspended impurity
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Correct Answer: C. Salt & Organic matter

Explanation:

Surface water is the water present on the Earth’s surface in rivers, lakes, ... Read More Details

8 Environmental Chemistry MCQs

Ozone is formed in the upper atmosphere from oxygen by the action of:

  • Free radicals
  • Cosmic rays
  • Nitrogen oxides
  • UV-rays
0 Comments
Correct Answer: D. UV-rays

Explanation:

Ozone (O₃) is formed in the stratosphere, the upper layer of the atmosphere. ... Read More Details

9 Environmental Chemistry MCQs

Which chemical removes phosphates from sewage water to prevent eutrophication?

  • Alum
  • Chlorine
  • Lime
  • Permanganate
0 Comments
Correct Answer: C. Lime

Explanation:

Phosphates in sewage water cause eutrophication, leading to excessive algae growth and oxygen ... Read More Details

10 Environmental Chemistry MCQs

The petrol having octane number 80 has ____________?

  • 20% n-heptane + 80% iso-octane
  • 80% n-heptane + 20% iso-octane
  • 20% n-heptane + 80% n-octane
  • 80% n-heptane + 20% n-octane
0 Comments
Correct Answer: A. 20% n-heptane + 80% iso-octane

Explanation:

The octane number of petrol is a measure of its ability to resist ... Read More Details

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