Chapter Exam

Unit 12: Environmental Chemistry — Online MCQ Test

Q: What is the main source of sulphur dioxide responsible for air pollution?

Answer: A. Combustion of fossil fuels containing sulphur — Burning coal and petroleum products releases sulphur dioxide because they often contain sulphur impurities. This is a major air pollutant.

Q: Acid rain is mainly caused by the presence of which gases in the atmosphere?

Answer: B. SO2 and NOx — Sulphur dioxide and nitrogen oxides react with atmospheric moisture to form sulphuric acid and nitric acid, leading to acid rain.

Q: If the concentration of greenhouse gases in the atmosphere increases, what is the most likely effect?

Answer: B. Increase in Earth's temperature — More greenhouse gases trap more infrared radiation, causing an increase in the Earth's average temperature.

CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 12: Environmental Chemistry with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY. This chapter covers: This chapter examines atmospheric water soil pollution greenhouse effect global warming and ozone depletion mechanisms. Students explore acid rain industrial waste control green ch.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 12: Environmental Chemistry — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY — Unit 12: Environmental Chemistry, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the main source of sulphur dioxide responsible for air pollution?

A. Combustion of fossil fuels containing sulphur ✓
B. Photosynthesis in plants
C. Evaporation of water
D. Natural nitrogen fixation

Answer: A. Combustion of fossil fuels containing sulphur
Burning coal and petroleum products releases sulphur dioxide because they often contain sulphur impurities. This is a major air pollutant.

Acid rain is mainly caused by the presence of which gases in the atmosphere?

A. CO2 and CH4
B. SO2 and NOx ✓
C. O2 and N2
D. H2 and He

Answer: B. SO2 and NOx
Sulphur dioxide and nitrogen oxides react with atmospheric moisture to form sulphuric acid and nitric acid, leading to acid rain.

Which statement best describes green chemistry?

A. It focuses on using only green-colored chemicals
B. It aims to reduce or eliminate the use of hazardous substances ✓
C. It is the study of plant pigments only
D. It deals only with recycling plastic waste

Answer: B. It aims to reduce or eliminate the use of hazardous substances
Green chemistry is designed to minimize pollution by reducing harmful chemicals in chemical processes and products.

If the concentration of greenhouse gases in the atmosphere increases, what is the most likely effect?

A. Lower average global temperature
B. Increase in Earth's temperature ✓
C. Decrease in sunlight reaching Earth permanently
D. Immediate disappearance of the ozone layer

Answer: B. Increase in Earth's temperature
More greenhouse gases trap more infrared radiation, causing an increase in the Earth's average temperature.

Which statement about CFCs is correct?

A. They destroy ozone in the troposphere by forming nitric acid
B. They release chlorine radicals under UV light in the stratosphere ✓
C. They are harmless because they do not react anywhere in the atmosphere
D. They reduce greenhouse warming by absorbing visible light only

Answer: B. They release chlorine radicals under UV light in the stratosphere
UV radiation breaks CFCs in the stratosphere, releasing chlorine radicals that catalytically destroy ozone molecules.