Easy MCQ +4 / -1 PYQ · JEE Mains 2021

Which one of the following statements is incorrect?

  1. A Atomic hydrogen is produced when H<sub>2</sub> molecules at a high temperature are irradiated with UV radiation.
  2. B At around 2000 K, the dissociation of dihydrogen into its atoms is nearly 8.1% Correct answer
  3. C Bond dissociation enthalpy of H<sub>2</sub> is highest among diatomic gaseous molecules which contain a single bond.
  4. D Dihydrogen is produced on reacting zinc with HCl as well as NaOH<sub>(aq)</sub>.

Solution

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

About this question

Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family

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