In atomic hydrogen and oxy-hydrogen torch, highest temperature is generated due to which of the following processes ?

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Dissociation of hydrogen molecules in to hydrogen atoms

Recombination of hydrogen atoms on welded surface

Reaction of hydrogen atoms with metal surface to be welded

Electric are used to dissociate hydrogen molecules

answer is B.

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Detailed Solution

To produce atomic hydrogen, molecular hydrogen is passed through an electric arc struck between tungsten electrodes at 3773−4273 K.
]Atomic hydrogen has a very small lifetime (0.3 sec).
It gets converted into molecular hydrogen and liberates large amount of energy.
This energy is used for cutting or welding purposes in the form of atomic hydrogen torch.

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