MHT CET202410 May 2024Morning ShiftChemistryChemical KineticsActual
Calculate rate constant of first order reaction if concentration of reactant decreases by 90 % in 30 minute?
Options
- A2.16 10⁻² ~min ⁻¹
- B3.52 10⁻² ~min ⁻¹
- C4.81 10⁻² ~min ⁻¹
- D7.67 10⁻² ~min ⁻¹
Correct answer
D. 7.67 10⁻² ~min ⁻¹
Step-by-step solution
Concentration decreases by 90 % . Hence, 10 % reactant is left after 30 minutes. aligned k & = 2.303 t ₁₀ [ ~A ]₀ [ ~A ]_ t k & = 2.303 30 ₁₀ 100 10 & = 2.303 30 ~min =7.67 10⁻² ~min ⁻¹ aligned