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Federal (FBISE) · Chapter test · Free

9th Class Chemistry Chapter 11 Test11. Environmental Chemistry - Air

29 marks · 40 minutes · 20 questions. Covers: 11. Environmental Chemistry - Air.

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9th Class Chemistry Chapter 11 Test

9th Class · Chemistry · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 29Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 9 × 1 = 9)

  1. Which is/are responsible for acid rain?
    1. SO₂
    2. NO₂
    3. Both NO₂ and SO₂
    4. O₃
  2. The normal rain has pH:
    1. 5.6
    2. 6.5
    3. 4.6
    4. 4.2
  3. What air pollution is released by forest fires and storms?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides
  4. Which is reddish brown gas?
    1. NO
    2. NO₂
    3. SO₂
    4. O₃
  5. What air pollution is released by electrical discharge?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides
  6. Most air pollution is caused by:
    1. Ozone
    2. Acid rain
    3. Carbon monoxide
    4. The burning of fossil fuels
  7. Which gas has the highest percentage in the air?
    1. O₂
    2. CO₂
    3. N₂
    4. O₃
  8. Chlorofluorocarbons are used in:
    1. solvant
    2. aerosols
    3. fridges
    4. all of these
  9. What air pollution is released by volcanos?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Define global warming.
  2. List two main sources of acid rain.
  3. List four human activities which contribute to air pollution.
  4. What is the role of automobile in air pollution?
  5. Condensed structural formula for butane is:
    1. CH₃–CH₂–CH₃
    2. CH₃–CH₂–CH₂–CH₃
    3. CH₃–CH₂–CH₂–CH₂–CH₃
    4. CH₃–CH₃
  6. What is the importance of catalytic converters?
  7. What process is used to purify water to produce distilled water?
    1. filtration
    2. distillation
    3. reverse osmosis
    4. sedimentation
  8. CH3–CH2–CH3 is the chemical formula for:
    1. Ethane
    2. Propane
    3. Butane
    4. Pentane

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Sulphur dioxide is a common pollutant from burning coal. State two effects caused by this pollutant.
  2. Describe acid rain and its effects.
  3. Describe global warming.