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JEE · NEET Previous Year Question

Which one of the following statements is incorrect ?

Topic: JEE PYQ

Answer: B. Full step-by-step solution below.

  1. AAtomic hydrogen is produced when 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 is highest among diatomic gaseous molecules which contain a singlebond.
  4. DDihydrogen is produced on reacting zinc with HCl as well as .

Correct answer: B

Solution

(b)
Atomic hydrogen is produced at high temperature in an electric are or under ultraviolet radiations The dissociation of dihydrogen at 2000K 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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