CBSE 2026 · Region 3 · Set 1 · Q18 · 2 marks

For a reaction $\displaystyle \mathrm{A}+\mathrm{B} \rightarrow$ Products, the rate law is : \[\text { Rate }=\mathrm{k}[\mathrm{~A}][\mathrm{B}]^{\frac{3}{2}} \] Write the overall order of the reaction. Can this reaction be an elementary reaction? Give reason in support of your answer.

CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.