Chemistry · Chemical Kinetics
JEE Main 2025 — 24 January, Evening Shift — Question 25
Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below :
- Option A:
Both Statement I and Statement II are false
- Option B:
Statement I is false but Statement II is true
- Option C:Correct
Both Statement I and Statement II are true
- Option D:
Statement I is true but Statement II is false
Answer: C
Step-by-step solution
For a first-order reaction, half-life t1/2 = 0.693/k, which is independent of initial concentration [R]0, so Statement I is true. Also, the integrated rate law gives log([R]0/[R]) = (k/2.303)t, so a plot of log([R]0/[R]) vs time is a straight line through origin with slope k/2.303, so Statement II is true. Hence both statements are true.
Answer key and solution verified before publishing.
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- Exam
- JEE Main 2025
- Subject
- Chemistry
- Chapter
- Chemical Kinetics
- Topic
- Integrated Rate Laws