JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Hydrogen

Deuterium resembles hydrogen in properties but :

(A)reacts vigorously than hydrogen
(B)emits $β^{+}$ particles
(C)reacts just as hydrogen
(D)reacts slower than hydrogen✓ Correct

Answer: (D)

Solution

The

D - D

bond has a lower zero-point energy and a higher dissociation energy than the

H - H

bond because of the greater mass of deuterium, so it is harder to break. Reactions that require breaking this bond therefore proceed more slowly for deuterium. Deuterium reacts more slowly than hydrogen.

JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Single correct option

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