Oxy-hydrogen flame is used for welding and cutting metals. Give reasons.

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Solution

Oxyhydrogen is a mixture of hydrogen and oxygen gases. The gaseous mixture is used for torches to process refractory materials and is used for welding. An oxyhydrogen torch is an oxy-gas torch which burns hydrogen(fuel) with oxygen (oxidizer). It is used for cutting and welding metal, glass and thermoplastics.

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Which of the following is used for the production of oxy-acetylene flame for welding and cutting metals?

Give reasons :

(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.

2000^{0} C

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