Question:
In the reaction: P + Q longrightarrow ?R + S The time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with time as shown in the figure. The overall order of the reaction is:
In the reaction: P + Q longrightarrow ?R + S The time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with time as shown in the figure. The overall order of the reaction is:
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For second-order reactions:
t₇5% = 2t₅0%
Zero-order reactions show linear concentration–time plots.
Updated On: Mar 19, 2026
- \(2\)
- \(3\)
- \(0\)
- 1
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The Correct Option is A
Solution and Explanation
Step 1: From the graph, concentration of Q decreases linearly with time. ⟹ Reaction is zero order with respect to Q
Step 2: Given: t₇5% = 2t₅0% This is a characteristic of a second order reaction with respect to P.
Step 3: Overall order: = order in P + order in Q = 2 + 0 = 2
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