Question

Which option is valid for a zero order reaction?

• A. $t_{3/4}=\frac{3}{2}t_{1/2}$
• B. $t_{1/2}=\frac{4}{2}t_{3/4}$
• C. $t_{1/2}=2t_{3/4}$
• D. $t_{3/4}=\left(t_{1/2}\right)^{2}$

Answer 1

Answer: (A)

$t_{3/4}=\frac{3}{2}t_{1/2}$

Answer 2

For a zero order reaction, A = [A] - kt $t_{1/2}=\frac{\left[A\right]_{0}}{2k}; t_{3/4}=\frac{3}{2}\frac{\left[A\right]_{0}}{2k} \therefore \frac{t_{3/4}}{t_{1/2}}=\frac{3}{2}$