ABC26PH1031 · Elementary Process Rate Constant

Subject: Physical Chemistry · Chapter: Elementary Process Rate Constant · Topic: Elementary Process Rate Constant – General · Exam: NET 2020-2021 · Marks: 2 · Difficulty: Hard

Photochemistry of a molecule, M, is described as by the mechanism
Elementary ProcessRate Constant
(i)$\mathrm{M}+\mathrm{hv} \rightarrow \mathrm{M}^{\bullet}$$\mathrm{I}_{\mathrm{abs}}$
(ii)$\mathrm{M}^{\bullet}+\mathrm{Q} \rightarrow \mathrm{M}+\mathrm{Q}$$\mathrm{k}_{\mathrm{Q}}[\mathrm{Q}]\left[\mathrm{M}^{\bullet}\right]$
(iii)$\mathrm{M}^{\bullet} \rightarrow \mathrm{M}+\mathrm{hv}_{\mathrm{F}}$$0.2\left[\mathrm{M}^{\bullet}\right]$
The intercept at $[\mathrm{Q}]=0$ is 4 for the inverse of fluorescence intensity $\left(\frac{\mathrm{I}}{\mathrm{I}_{\mathrm{F}}}\right)$ vs $[\mathrm{Q}]$ plot. The value of $\mathrm{I}_{\mathrm{abs}}$ is
(a)4
(b)0.25
(c)20
(d)0.8
Answer
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Explanation
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