ABC26PH0675 · Chemical Kinetics
Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Chemical Kinetics – General · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Easy
(a) For the reaction $\mathrm{R} \rightarrow \mathrm{P}$, the plot of $\ln[\mathrm{R}]$ versus time ($t$) gives a straight line with a negative slope. The half life for the reaction is 3 minutes. ($\ln 2 = 0.693$, $\ln 0.1 = -2.303$) (i) Derive the expression for $\mathrm{t_{1/2}}$. (ii) Calculate the slope of the straight line (iii) Calculate the time required for the concentration of R to decrease to 10\% of its initial value.
(b)Shown below is the Jablonski diagram that describes various photophysical processes. The solid arrows $(\rightarrow)$ represent radiative transitions and the wave arrow ( × ) represents a non-radiative transition. 
(i) Name the photophysical pathways X, Y and Z. (ii) Which of the radiative decays is faster?
(i) Name the photophysical pathways X, Y and Z. (ii) Which of the radiative decays is faster?Answer
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Explanation
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