1. Environmental chemistry deals with:
A) Study of metals
B) Study of environment and chemical processes
C) Study of medicines
D) Study of plastics
Answer: B
2. The main component of air is:
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon
Answer: B
3. Which gas is responsible for global warming?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium
Answer: C
4. Acid rain is mainly caused by:
A) CO₂ and O₂
B) SO₂ and NO₂
C) N₂ and O₂
D) H₂ and O₂
Answer: B
5. Ozone layer protects us from:
A) Infrared rays
B) UV rays
C) Visible light
D) X-rays
Answer: B
6. The pH of acid rain is usually:
A) Above 7
B) Equal to 7
C) Below 5.6
D) Above 9
Answer: C
7. Greenhouse effect is caused by:
A) Ozone
B) Nitrogen
C) Greenhouse gases
D) Hydrogen
Answer: C
8. Which is a greenhouse gas?
A) O₂
B) CO₂
C) N₂
D) Ar
Answer: B
9. Water pollution is caused by:
A) Clean water
B) Industrial waste
C) Oxygen
D) Hydrogen
Answer: B
10. BOD stands for:
A) Biological Oxygen Demand
B) Basic Oxygen Demand
C) Biochemical Oxygen Data
D) None
Answer: A