Chemistry Reaction Kinetics NUMS 2023
PMDC Verified Question 26 of 80
When nitric oxide reacts with ozone, the order of reaction will be:
A
2nd
B
3rd
C
1st
D
Zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 2nd
Concept:

The reaction between nitric oxide and ozone in the atmosphere is a fundamental gas-phase reaction whose kinetics are determined experimentally.

Formula:

$$ \text{NO}_{(g)} + \text{O}_{3(g)} \longrightarrow \text{NO}_{2(g)} + \text{O}_{2(g)} $$
$$ \text{Rate} = k[\text{NO}][\text{O}_3] $$

Solution:

  • Experimental observations show that the rate of this reaction is directly proportional to the first power of the concentration of NO and the first power of the concentration of O\(_3\).
  • Adding the exponents from the rate law: \( 1 + 1 = 2 \).
  • Therefore, the reaction is strictly 2nd order overall.


Why other options are incorrect:

It is an elementary bimolecular reaction; hence it does not exhibit 1st, 3rd, or zero-order kinetics.

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