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The gas.................. has a well-known unpleasant stench and is colourless and lethal. It has been observed both on Earth and in space. It is largely formed by the anaerobic decomposition of plant and animal materials.

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oxide

ammonia

nitrogen gas

chlorine

answer is B.

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Detailed Solution

Ammonia is an odourless, lethal gas with a well-known unpleasant smell. It has been observed both on Earth and in space. It is largely formed by the anaerobic decomposition of plant and animal materials.

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