a) 374°C
b) 157.5°C
c) 31.0°C
d) 240.9°C
Answer: a
Explanation: The critical point of water is 374°C. The critical point of sulphuric acid is 157.5°C. The critical point of supercritical carbon dioxideis 31.0°C. The critical point of ethanol is 240.9°C.
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