Q20 / 150 · MHT CET 2020 (20 Oct Shift 1) · Chemistry

What is the molecularity and order of the following reaction if rate law is rate $=\mathrm{K}\left[\mathrm{O}_{3}\right][\mathrm{O}]$ respectively? $\mathrm{O}_{3(\mathrm{~g})}+\mathrm{O}_{(\mathrm{g})} \longrightarrow 2 \mathrm{O}_{2(\mathrm{~g})}$

  • A
    3 and 2
  • B
    3 and 1
  • Correct answer
    C
    3 and 2
  • D
    4 and 2

Solution

$\mathrm{O}_{3(\mathrm{g})}+\mathrm{O}_{(\mathrm{g})} \longrightarrow 2 \mathrm{O}_{2(\mathrm{g})}$ i. rate $=\mathrm{k}\left[\mathrm{O}_{3}\right][\mathrm{O}]$ $\therefore$ Order of reaction $=2$ ii. Molecularity (No. of reactant molecules taking part in reaction) $=2$

Hence, the correct answer is option: 'C'.

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