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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen3 Marks
Question
How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.
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Answer

Atomic hydrogen atoms are produced by the dissociation of dihydrogen with the help of an electric arc. This releases a huge amount of energy ( $435.88 \mathrm{~kJ} \mathrm{~mol}{ }^{-1}$ ). This energy can be used to generate a temperature of 4000 K , which is ideal for welding and cutting metals. Hence, atomic hydrogen or oxy-hydrogen torches are used for these purposes. For this reason, atomic hydrogen is allowed to recombine on the surface to be welded to generate the desired temperature.

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