Q134 · CSIR-NET Chemistry, June 2011

Paper: CSIR-NET June 2011 · Subject: Physical Chemistry · Chapter: Nuclear Chemistry · Topic: Nuclear Chemistry – General · Marks: 2 · Difficulty: Easy

The reactive cross section is expected to be the largest for the reaction
(a)$\mathrm{Li}+\mathrm{Cl}_{2} \rightarrow \mathrm{LiCl}+\mathrm{Cl}$
(b)$\mathrm{Na}+\mathrm{Cl}_{2}$
(c)$\mathrm{K}+\mathrm{Cl}_{2}$
(d)$\mathrm{Rb}+\mathrm{Cl}_{2}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
In the harpoon mechanism the cross-section grows as the metal's ionisation energy falls: Rb gives the largest (d).

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