First slide

Hydrogen

Question

Statement I: Hydrogen reacts faster with halogens than deuterium.
Statement II : The activation energy of hydrogen is less than that of deuterium.

Easy

A

Statement I and Statement II are true.
B

Statement I is true and statement II is false.
C

Statement I is false and Statement II is true.
D

Statement I and Statement II are false.

Solution

Reactivity of $X_{2}$ with $H_{2} & D_{2}$
$H_{2} + X_{2} \to 2 HX; r_{1} D_{2} + X_{2} \to 2 DX; r_{2}$
rate : $r_{1} > r_{2}$
$[E_{a} α \frac{1}{Rate of reaction}]$

Ea:(Ea)1 < (Ea)2

Ea: The minimum energy suplied to the reactants inorder to form the activated complex is called "Ea"
In case of $D_{2}$ reaction the D-D bond energy greater than that of $H_{2}$ Bond dissociation energy, therefore in order to activate $D_{2}$ require more energy.

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