Given below are two statements. In the light of the above statements, choose the most appropriate answer from the options given below.
Statement I:Two categories of Ozone Depleting Substances (ODS) were Class I and Class II.
Statement II:Production of Class II ODS ceased in 2000.
ABoth Statement I and Statement II are correct
BBoth Statement I and Statement II are incorrect
CStatement I is correct but Statement II is incorrect ✓ Correct
DStatement I is incorrect but Statement II is correct
Correct answer: (C) Statement I is correct but Statement II is incorrect
Explanation
The Montreal Protocol did classify ozone depleting substances into Class I and Class II groups.
Statement 1 is correct: Class I covers the most damaging chemicals like CFCs and halons, Class II the HCFCs.
Statement 2 is wrong: it was Class I production that was largely phased out around 1996, not Class II in 2000.
Class II substances such as HCFCs are phased out much later, on a schedule extending toward 2030.
The two-class split let less harmful transitional chemicals stay in use for longer.
Ozone depletion potential is measured relative to CFC-11, which is set at a value of one.
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