NEET 2026 (Phase 1) · ChemistryIntegrated ratePrevious Year Question
For a certain reaction \ce{R -> Product}, the plot of concentration $[R]$ versus time is a straight line with a constant negative slope, as shown in the graph. The order of the reaction is:
![NEET 2026 (Phase 1) Chemistry question — For a certain reaction \ce{R -> Product}, the plot of concentration $[R]$ versus time is…](https://firebasestorage.googleapis.com/v0/b/halal-neet--masha-allah.firebasestorage.app/o/pyq_images%2FChemicalKinetics%2Fck_pyq_2026_75.png?alt=media&token=408a3b2e-2b4c-4b40-a0a5-844e48a713cb)
- A.$0$✓
- B.$1$
- C.$2$
- D.$2.5$
Correct Answer
(A) $0$
Solution & Explanation
\textbf{Answer:} (A) $0$ \textbf{Solution:} For a zero-order reaction, the integrated rate law is: $[R] = [R]_0 - kt$ This is the equation of a straight line in $[R]$ vs $t$ with a constant negative slope equal to $-k$. Since the given plot is a straight line with constant negative slope, the reaction is zero order.
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