The minimum value of DO required for water to be pure is:
- 1 ppm
- 2 ppm
- 3 ppm
- 4 ppm
Submitted by :- Muhammad Nawaz
CHEMISTRY
Prepare for your upcoming test with a comprehensive collection of Chemistry multiple-choice questions (MCQs), ranging from basic to advanced topics. These Chemistry MCQs cover various sections of the subject, providing you with valuable practice and boosting your chances of scoring well in the Chemistry portion of the test. Whether you’re a student or a job seeker preparing for exams, these MCQs will prove beneficial for your test preparation.
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Which of the following is secondary pollutant?
- PAN
- CO₂
- CO
- Aerosol
Submitted by :- Muhammad Nawaz
Which statement is/are true regarding particulate matter?
- They are responsible for cloud and fog formation
- They determine the heat balance of the earth through reflection of radiation
- They are responsible for several catalytic reactions in the atmosphere
- All of these
Submitted by :- Muhammad Nawaz
Earth is protected from UV radiations by which of the following?
- Carbon dioxide layer
- Oxygen layer
- Troposphere
- Ozone layer
Submitted by :- Muhammad Nawaz
Ozone depletion in stratosphere will result in which of the following?
- Increased incidence of skin cancer
- Forest fires
- Global warming
- Acid rain
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Ozone layer of upper atmosphere is being destroyed by
- Photochemical oxidants/O2 and CO₂
- SO2
- Chlorofluorocarbons
- Smog
Submitted by :- Muhammad Nawaz
Which is atmosphere pollutant ?
- CO2
- CO
- O2
- N2
Submitted by :- Muhammad Nawaz
Air pollution is not caused by which of the following?
- Pollen grains
- Automobiles
- Industries
- Hydroelectric power
Submitted by :- Muhammad Nawaz
What is Result of ozone hole?
- Acid rain
- Greater exposure of earth to U.V. rays
- Increased amount of CO2
- Global warming
Submitted by :- Muhammad Nawaz
Green chemistry refers to:
- Chemistry of plants
- Chemistry of green pigments
- Development of chemical products and processes less harmful to humans
- Chemistry of greenhouse effect
Submitted by :- Muhammad Nawaz