Question Bank › Physical Chemistry › Chemical Kinetics › ABC26PH0896In atom recombination reactions · ABC26PH0896 Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Chemical Kinetics – General · Exam: CSIR NET JUNE 2013 · Marks: 2 · Difficulty: Easy
In atom recombination reactions
(a) $\mathrm{E}_{\mathrm{a}}=0, \Delta \mathrm{S}^{\#}=+\mathrm{ve}, \Delta \mathrm{H}^{\#}=+\mathrm{ve}$
(b) $\mathrm{E}_{\mathrm{a}}=0, \Delta \mathrm{S}^{\#}=-\mathrm{ve}, \Delta \mathrm{H}^{\#}==-\mathrm{ve}$
(c) $\mathrm{E}_{\mathrm{a}}=+\mathrm{ve}, \Delta \mathrm{S}^{\#}=-\mathrm{ve}, \Delta \mathrm{H}^{\#}=-\mathrm{ve}$
(d) $\mathrm{E}_{\mathrm{a}}=+\mathrm{ve}, \Delta \mathrm{S}^{\#}=+\mathrm{ve}, \Delta \mathrm{H}^{\#}=+\mathrm{ve}$
Answer Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation Atom recombination has no barrier (Ea ≈ 0), a negative entropy of activation (two particles → one) and a negative enthalpy of activation (bond forming).
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