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JEE Main202131 Aug 2021Evening ShiftChemistryHydrogenActual

Which one of the following statements is incorrect ?

Options

  1. AAtomic hydrogen is produced when H 2 molecules at a high temperature are irradiated with UV radiation.
  2. BAt around 2000   K , the dissociation of dihydrogen into its atoms is nearly 8 . 1 %
  3. CBond dissociation enthalpy of H 2 is highest among diatomic gaseous molecules which contain a single bond.
  4. DDihydrogen is produced on reacting zinc with HCl as well as NaOH ( aq ) . .

Correct answer

B. At around 2000   K , the dissociation of dihydrogen into its atoms is nearly 8 . 1 %

Step-by-step solution

Atomic hydrogen is produced at high temperature in an electric arc 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.).

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