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Atomic hydrogen is obtained by:

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electrolysis of heavy water

thermal decomposition of water

passing silent electric discharge through hydrogen at low pressure

reaction of water with heavy metals

answer is D.

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Detailed Solution

Atomic hydrogen is obtained by passing ordinary hydrogen through an electric arc.
$H_{2} \to_{arc, 200^{\circ} C}^{Electric} 2 H; ΔH = 104 .5 kcal {mol}^{- 1}$

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