Question

Which of the following is the slope of the first order reaction in the plot of ln[R] vs. time ?

• A. +k
• B. $\frac{+k}{2.303}$
• C. –k
• D. $\frac{–k}{2.303}$

Hint:

First order: slope of ln[R] vs. t is always negative.

Answer 1

The Correct Option is C

The integrated rate law for a first-order reaction is expressed as:
ln[R] = –kt + ln[R]$_0$
Consequently, the slope obtained from plotting ln[R] against time is –k.