___________________flame is used for cutting and welding.

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Solution

Hydrogen and oxygen are burnt together to produce an oxyhydrogen flame with a temperature of 2800 $°$ Celsius to 3300 $°$ Celsius. this flame is used for cutting and welding metals.

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(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

A mixture of oxygen and ethyne is burnt for welding can you tell why a mixture of ethyne and air is not used?

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