A. Fill in the blank spaces by choosing the correct words from the given list.
List: Oxygen, carbonic, sulphur dioxide gas, precipitation, helium
1.____________ can cause acid rain.

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Solution

Acid rain occurs when the concentration of rain has a pH value of less than 5.5.
When acidic oxides like sulfur dioxide (SO₂) and nitrogen dioxide (NO₂) present in the air react with rain water they form acids like sulfuric acid (H₂SO₄) and nitric acid (HNO₃), which fall like acid rain on the earth.
Therefore, sulfur dioxide gas can cause acid rain.

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