Q.7. Sulphur dioxide react with water vapor and other substances in the air to form
a) carbonic acid (H2CO3)
c) sulphuric acid (H2SO4)
b) hydrochloric acid (HCI)
d) nitric acid (HNO3)
Q.8. Nitrogen oxides react with water vapor and other substances in the air to form
a) carbonic acid (H2CO3)
c) sulphuric acid (H2SO4)
b) hydrochloric acid (HCI)
d) nitric acid (HNO3)
Q.9. Which of the following term defines as the release of harmful substances into the
environment?
a) Transpiration
c) Precipitation
Q.10. Acid rain
b) Pollution
d) Deposition
the pH of lakes and rivers which harms fish, clams, and other
aquatic animals.
a) increases
Q.11. A pH of 7.0 is defined as
a) acidic
c) neutral
b) decreases
b) alkaline
d) basic
0.12 What is the pH of pure water?

Acid rain is a phenomenon caused by the reaction of sulfur dioxide (SO2) and nitrogen oxides (NOx) with water vapor in the atmosphere, forming sulfuric acid (H2SO4) and nitric acid (HNO3) that fall back to Earth. These acids lower the pH of rainwater below 5, affecting ecosystems and infrastructure. The presence of these pollutants in the atmosphere leads to the creation of acid rain, posing environmental risks.

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