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A scrubber in the exhaust of a chemical industrial plant removes:-

1. gases like sulphur dioxide
2. particulate matter of the size 5 micrometer or above
3. gases like ozone and methane
4. particulate matter of the size 2.5 micrometer or less

Correct answer: gases like sulphur dioxide

Solution

A scrubber passes polluted exhaust through a liquid so certain gases dissolve or react out of the stream. Sulphur dioxide is a classic target because it is an acidic gas that can be removed efficiently this way.

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