Question

Which one of the following statements is incorrect ?

• A. Atomic hydrogen is produced when $H _{2}$ molecules at a high temperature are irradiated with UV radiation.
• B. At around $2000\, K$, the dissociation of dihydrogen into its atoms is nearly $8.1 \%$.
• C. Bond dissociation enthalpy of $H _{2}$ is highest among diatomic gaseous molecules which contain a single bond .
• D. Dihydrogen is produced on reacting zinc with $HCl$ as well as $NaOH _{(\text {aq })}$

Answer 1

Answer: (B)

Atomic hydrogen is produced at high temperature in an electric are or under ultraviolet radiations The dissociation of dihydrogen at $2000\, K$ is only $0.081 \%$
H-H bond dissociation enthalpy is highest for a single bond for any diatomic molecule.
Dihydrogen can be produced on reacting $Zn$ with dil. $HCl$ as well as $NaOH$ (aq.)