CAIE A-Level Chemistry AS 1.3.9 Free Radical As a Species with One or More Questions

Practise defining free radicals as species with one or more unpaired electrons, then identify them in molecules, ions and atmospheric reaction steps.

Exam points

Describe a free radical as a species with one or more unpaired electrons and identify free radicals in chemical species.

[Maximum number: 1]

In which pairs are both species free radicals?
1 Cland O
$2 \mathrm{Cl}^{-}$ and $\mathrm{O}^{2-}$
3 Cl and $\mathrm{O}^{-}$ $4 \mathrm{Cl}^{+}$ and $\mathrm{O}^{2+}$

1, 3 and 4

1 and 3 only

1 only

2 only

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CAIE A-Level Chemistry AS 1.3.9 Free Radical As a Species with One or More Questions question 1