Question : At room temperature and atmospheric pressure, ______ has a density of 1.87 kg/m3, which is 1.5 times heavier than air and exists as a liquid below the critical temperature of 31°C.
Option 1: carbon dioxide
Option 2: nitrogen
Option 3: hydrogen
Option 4: lithium
Correct Answer: carbon dioxide
Solution : The correct option is carbon dioxide .
At room temperature and atmospheric pressure, carbon dioxide has a density of about 1.87 kg/m³, making it approximately 1.5 times heavier than air. It exists as a gas at room temperature but can become a liquid below its critical temperature of 31.1°C and pressure of 73.8 atmospheres.
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