NEET2012ChemistryChemical KineticsActual
In the first order reaction, 75 % of the reactant gets disappeared in 1.386 hours. The rate constant of the reaction is
Options
- A3.0 10⁻³ ~s ⁻¹
- B2.8 10⁻⁴ ~s ⁻¹
- C17.2 10⁻³ ~s ⁻¹
- D1.8 10⁻³ ~s ⁻¹
Correct answer
B. 2.8 10⁻⁴ ~s ⁻¹
Step-by-step solution
For a first order reaction, k= 2.303 1.386 60 60 a a-0.75 a = 2.303 1.386 60 60 4=2.8 10⁻⁴ ~s ⁻¹