Question

In a zero-order reaction, if the initial concentration of the reactant is doubled, the time required for half the reactant to be consumed:

• A. increases two-fold
• B. increases four-fold
• C. decreases by half
• D. does not change

Answer 1

Answer: (A)

increases two-fold

For a zero order reaction, $t_{1/2}=\frac{[A{]}_o}{2k}$

Time increases twice as half-life is directly proportional to initial concentration