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Q.

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

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a

Dissociation  of hydrogen molecules in to hydrogen  atoms 

b

Recombination of hydrogen atoms on welded surface

c

Electric are used to dissociate hydrogen molecules

d

Reaction of hydrogen atoms with metal surface to be welded

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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