JEE Main 202623 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 23 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Chemical Kinetics
JEE Main 2026 · 23 January · Morning Shift · Chemistry · Chemical Kinetics
For the thermal decomposition of reactant AB(g) , the following...
For the thermal decomposition of reactant , the following plot is constructed.
The half life of the reaction is ' . min. (Nearest integer)
The half life of the reaction is ' . min. (Nearest integer)
Correct answer
0
Step-by-step solution
From the concentration vs. time graph, the thermal decomposition of AB(g) shows a linear decrease in concentration, indicating zeroth-order kinetics.
Initial concentration: [AB]₀ = 0.6 M at t = 0 s.
Reading from the graph: [AB] = 0.5 M at t = 200 s.
Rate of decomposition: Δ[AB]/Δt = (0.6 - 0.5) M / 200 s = 0.0005 M/s.
For zeroth-order kinetics: [AB] = [AB]₀ - kt.
Half-life occurs when [AB] = [AB]₀/2 = 0.3 M.
0.3 = 0.6 - 0.0005 × t₁/₂.
t₁/₂ = 0.3 / 0.0005 = 600 s = 10 min.
Initial concentration: [AB]₀ = 0.6 M at t = 0 s.
Reading from the graph: [AB] = 0.5 M at t = 200 s.
Rate of decomposition: Δ[AB]/Δt = (0.6 - 0.5) M / 200 s = 0.0005 M/s.
For zeroth-order kinetics: [AB] = [AB]₀ - kt.
Half-life occurs when [AB] = [AB]₀/2 = 0.3 M.
0.3 = 0.6 - 0.0005 × t₁/₂.
t₁/₂ = 0.3 / 0.0005 = 600 s = 10 min.