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MHTCET 26 Apr 2025 Shift 1 Paper

Question : 56 of 150

Marks: +1, -0

2 \mathrm{NO}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})}

Solution:

Concept:

The order of a reaction is the sum of the exponents of the concentration terms in its rate law.

Explanation:

The given reaction is

2\mathrm{NO}_{2(\mathrm{g})} \rightarrow 2\mathrm{NO}_{(\mathrm{g})} + \mathrm{O}_{2(\mathrm{g})}

Its experimentally determined rate law is:

\text{rate} = k[\mathrm{NO}_2]^2

Here, the exponent of

[\mathrm{NO}_2]

2

Thus, the reaction is of second order.

Hence, the correct option is C.

Answer:

The order of the reaction is

2

(Option C).

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