Chemistry 9th Chap 10 : Topic 8 - Maryam Publications

Chemistry Chapter 10 : Topic 8

Acid Rain

1 / 18

A city experiences heavy rainfall. Scientists later find that the rainwater has a pH of 4.2 instead of normal 5.6. Which statement best explains this phenomenon?

A) The rain contains only pure water condensed from clouds.

B) The rain has absorbed excess oxygen from the atmosphere.

C) The rain has dissolved acidic gases like sulfur dioxide and nitrogen oxides.

D) The rain has mixed with alkaline dust particles in the air.

2 / 18

Acid rain is best defined as:

A) Rainwater that contains only carbon dioxide dissolved in it.

B) Rain formed only in industrial areas with no natural occurrence.

C) Rainwater that becomes acidic due to dissolved sulfur and nitrogen oxides.

D) Rain having a pH higher than 7 due to atmospheric pollution.

3 / 18

A student observes that marble statues in a polluted city are slowly eroding over time. The most likely cause is:

A) Freezing of rainwater on marble surface

B) Reaction of marble with acidic components of rainwater

C) Deposition of dust particles on statues

D) Excess oxygen reacting with calcium carbonate

4 / 18

Which sequence correctly describes acid rain formation?

A) Water vapor → Oxygen → Carbon dioxide → Rain

B) Carbon dioxide → Photosynthesis → Acid formation → Rain

C) Sulfur dioxide / NOₓ → Atmospheric moisture → Acid formation → Rainfall

D) Nitrogen → Oxygen → Clouds → Pure rain

5 / 18

Why is normal rain slightly acidic even without pollution?

A) Due to dissolved oxygen

B) Due to dissolved nitrogen gas

C) Due to dissolved carbon dioxide forming weak carbonic acid

D) Due to ozone presence in clouds

6 / 18

Which of the following is a major harmful effect of acid rain on aquatic ecosystems?

A) Lowers pH of lakes harming aquatic life

B) Increases oxygen level in water

C) Increases fish reproduction rate

D) Raises water temperature significantly

7 / 18

A region with very low industrial activity still receives acid rain due to wind transport. This indicates that acid rain:

A) requires direct chemical mixing on ground

B) can travel long distances in the atmosphere before falling

C) only forms locally near factories

D) is formed only during thunderstorms

8 / 18

Which gases are mainly responsible for acid rain formation?

A) Sulfur dioxide and nitrogen oxides

B) Hydrogen and helium

C) Oxygen and nitrogen

D) Carbon dioxide and methane

9 / 18

Acid rain is most harmful to buildings made of:

A) Steel

B) Glass only

C) Marble and limestone

D) Plastic materials

10 / 18

Which statement correctly explains why acid rain is considered an environmental hazard?

A) It increases soil fertility.

B) It damages ecosystems, buildings, and water bodies.

C) It improves air quality in cities.

D) It neutralizes all atmospheric pollutants.

11 / 18

A factory releases large amounts of sulfur dioxide into the air. Which environmental effect is most directly linked to this emission?

A) Increase in oxygen concentration

B) Formation of ozone layer

C) Increase in atmospheric nitrogen

D) Acid rain formation

12 / 18

In a laboratory simulation, sulfur dioxide is bubbled through water. The resulting solution becomes acidic because:

A) SO₂ reacts with water forming sulfurous acid.

B) SO₂ turns into solid sulfur.

C) SO₂ increases oxygen concentration in water.

D) SO₂ removes hydrogen from water.

13 / 18

Which human activity contributes most to acid rain formation?

A) Burning fossil fuels in industries and vehicles

B) Farming with organic fertilizers

C) Recycling plastic waste

D) Drinking water purification

14 / 18

Acid rain can indirectly affect soil fertility by:

A) Increasing nitrogen fixation in soil

B) Increasing soil pH to alkaline level

C) Washing away essential minerals from soil

D) Adding more humus to soil

15 / 18

A student claims acid rain is purely a natural phenomenon. This statement is:

A) True only in deserts

B) Completely true

C) Completely false

D) Partially true because natural CO₂ causes slight acidity, but pollution causes strong acid rain

16 / 18

Which of the following best describes the pH range of acid rain?

A) Exactly 7

B) Always 0

C) Above 7

D) Below 5.6

17 / 18

Which of the following best explains why acid rain is more common in industrial regions?

A) More evaporation occurs in cities.

B) More trees release acidic gases.

C) Higher emission of SO₂ and NOₓ from factories and vehicles.

D) Higher oxygen levels in cities.

18 / 18

Acid rain formation involves which type of chemical process in the atmosphere?

A) Chemical reaction between pollutants and water vapor

B) Neutralization reaction

C) Combination of gases without chemical change

D) Physical condensation only

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