Discussion
With reference to the cause of ozone layer depletion which of the following statement is incorrect ?
Answer: C
The incorrect statement is the one claiming stratospheric aerosols are the only matter that protects against ozone depletion.
Stratospheric aerosols, such as the sulphate droplets injected by large volcanic eruptions, do not protect the ozone layer. Their surfaces host chemical reactions that convert stable chlorine compounds into active forms, so they increase ozone destruction. The same chemistry on polar stratospheric clouds drives the Antarctic ozone hole.
The other statements are broadly correct: natural substances such as hydrogen oxides, methane and nitrogen oxides take part in ozone-destroying reactions; volcanic eruptions can add chlorine to the stratosphere; and any process that releases chlorine atoms there is serious, because one chlorine atom can destroy many thousands of ozone molecules in a catalytic cycle.
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