Discussion
Which substances were identified as catalysing ozone destruction?
Answer: C
Molina and Rowland showed that chlorofluorocarbons, being inert in the troposphere, reach the stratosphere intact and are then photolysed to release chlorine atoms that catalytically destroy ozone. A single chlorine atom can destroy many thousands of ozone molecules. Volcanic sulphate does provide surfaces for heterogeneous chemistry, which makes that a genuine contributory factor rather than a wholly wrong answer. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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