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Q.

The conversion of atomic hydrogen into ordinary hydrogen is

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a

An exothermic change

b

No energy change

c

None of the above

d

An endothermic change

answer is A.

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Detailed Solution

$\underset{(g)}{2 H} \to_{}^{} \underset{(g)}{H_{2}}; Δ H = - 436 k j / m o l e$ and the liberated energy used as atomic hydrogen blow torch.

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