Question

Find the ratio of $t_{0.75}$ to $t_{0.50}$ for a first order reaction.

• A. $4:3$
• B. $3:2$
• C. $2:1$
• D. $1:2$

Answer 1

Answer: (C)

$t_{0.75}=\frac{2.303}{k}log\frac{100}{25}$
$t_{0.25}=\frac{2.303}{k}log\frac{100}{50}$
$t_{0.75}:t_{0.25}=2:1$