Chemical Kinetics · JEE Main previous year questions

2004 2 questions

1. Q1852004 · 24 Apr 2004 · Shift 1

   In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

   1. A.30 minutes
   2. B.60 minutes
   3. C.7.5 minutes
   4. D.15 minutes
   Show answer

   Answer: A

2. Q2092004 · 24 Apr 2004 · Shift 1

   Rate of the reaction $$\mathrm{R}-\mathrm{C}(=\mathrm{O})-\mathrm{Z}+\mathrm{N}{\mathrm{u}}^{-}⟶\mathrm{R}-\mathrm{C}(=\mathrm{O})-\mathrm{Nu}+{\mathrm{Z}}^{-}$$ is fastest when $Z$ is

   1. A.$\mathrm{O}{\mathrm{C}}_2{\mathrm{H}}_5$
   2. B.$\mathrm{N}{\mathrm{H}}_2$
   3. C.$\mathrm{Cl}$
   4. D.$\mathrm{OCOC}{\mathrm{H}}_3$
   Show answer

   Answer: C