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A mixture of oxygen and ethyne is burnt for welding. Why a mixture of ethyne and air is not used?

1. ethene can not burn in air
2. incomplete combustion takes place
3. ethene burn in air with explosion
4. none of these

Correct answer: incomplete combustion takes place

Solution

Air contains only about 21% oxygen, so ethyne does not get enough oxygen for complete combustion. This leads to incomplete combustion, producing a sooty, less hot flame unsuitable for welding.

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