NTA Abhyas NEET2020ChemistryChemical KineticsPractice
A first order reaction with respect to reactant A , has a rate constant 6 min − 1 . If we start with A = 0.5 mol L − 1 , when would [ A ] reach the value 0.05 mol L − 1
Options
- A0.384 min
- B0.15 min
- C3 min
- D3.84 min
Correct answer
A. 0.384 min
Step-by-step solution
We know that for first order kinetics k = 2.303 t l o g a a - x a-x = 0.05   mol   L − 1 6 = 2.303 t l o g 0.5 0.05 or t = 2.303 6 log 0.5 0.05 = 2.303 6 = 0.384 min