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# Which one of the following statements is incorrect?

Question:

Which one of the following statements is incorrect?

1. Atomic hydrogen is produced when $\mathrm{H}_{2}$

2. At around $2000 \mathrm{~K}$, the dissociation of dihydrogen into its atoms is nearly $8.1 \%$.

3. Bond dissociation enthalpy of $\mathrm{H}_{2}$ is highest among diatomic gaseous molecules which contain a single bond.

4. Dihydrogen is produced on reacting zine with $\mathrm{HCl}$ as well as $\mathrm{NaOH}_{\text {(aa) }}$.

Correct Option: , 2

Solution:

Atomic hydrogen is produced at high temperature in an electric are or under ultraviolet radiations

The dissociation of dihydrogen at $2000 \mathrm{~K}$ is only $0.081 \%$

$\mathrm{H}-\mathrm{H}$ bond dissociation enthalpy is highest for a single bond for any diatomic molecule.

Dihydrogen can be produced on reacting $\mathrm{Zn}$ with dil. $\mathrm{HCl}$ as well as $\mathrm{NaOH}$ (aq.)