JEE Main 2019 Chemistry question
The reaction 2X → B is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the initial concentration of X is 0.5 M, the time required to reach its final concentration of 0.2 M will be:
Answer: (A)
Solution
X falls at 0.1 M per 6 h; 0.3 M takes 18 h.