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The conversion of atomic hydrogen into o...

The conversion of atomic hydrogen into ordinary hydrogen is

A

exothermic change

B

endothermic change

C

nuclear change

D

photochemical change

Text Solution

Verified by Experts

The correct Answer is:
A
Atomic hydrogen combines to form ordinary hydrogen with the evolution of 104.2 kcal of heat (exothermic process). This recombination is catalyzed by certain metals.
`H+H rarr H_(2) : DeltaH= - 104.2`kcal
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