The harmless gases released by thermal power plants and smelters are

Carbon dioxide and oxygen

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Nitrogen and oxygen

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Nitrogen and ozone

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Nitrogen and methane

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Solution

The correct option is B
Nitrogen and oxygen

The harmless gases released by thermal power plants and smelters are nitrogen and oxygen. In thermal power plants, heat energy is converted to electric power. Mostly steam is released in the process of smelting, which is a form of extractive metallurgy to produce a base metal from its ore.

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