Why does rain water normally have a pH of about 5.6? When does i

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71.

What is acid rain? Discuss its harmful effects. 

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72.

Why does rain water normally have a pH of about 5.6? When does it become acid rain ?


Rain -water normally has a pH of 5.6 due to the formation of carbon dioxide present in the atmosphere. 


When the pH of the rain drops below 5.6, it becomes acidic. Actually, the acidity of rain water is increased due to the large quantity of SO2 and oxides of nitrogen present in the air.

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73.

What is the cause of acid rain? How is it harmful to the environment?

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Statues and monuments in India are affected by acid rain. How?

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76.

What is green house effect and global warming?

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77.

What are the consequences of green house effect?
Or
What is the effect on the global warming due to the green house effect?

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78.

What is water pollution? What are the principal sources of water pollution?

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79.

What are the major causes of water pollution? Explain. 

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