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SO₂ is removed from flue gases by passing them through a solution containing citrate ions which form a complex.

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22.

How does SO_x enter the atmosphere?

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23. Which disease is caused due to SO_xin the atmosphere?

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24.

Name the main phenomenon occurring in the troposphere.

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25.

What do you mean by green house gases?

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26.

List gases which are responsible for green-house effect?

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27.

What is the role of CO₂ in the ‘green house effect’?

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28.

Name two important sinks of CO_2.

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29.

What are the major sources of CO₂production?

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30.

How is ozone layer formed?

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