One way of preventing pollution of the air is by passing exhaust gases through a filter. Glass fibre or silicone-treated bags of textile material are used for filtering.

Hot gases

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High pressure gases

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Cold gases

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Reactive gases

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Solution

The correct option is A Hot gases
Silicone coated fiberglass bags are resistant to high temperatures and are able to separate at a temperature range of approximately $- 50^{o} C$ to $+ 250^{o} C$ . Thus it has excellent weather proof and water repellent properties. It is also resistant to chemicals. It is used to filtering hot gases as it can withstand high temperatures.

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