Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case.
All of the following statements about carbon dioxide are true EXCEPT:
Select an Answer
It can be prepared by the action of acid on limestone.
It is used to extinguish fires.
It dissolves in water at room temperature.
It sublimes rather than melts at and atmosphere pressure.
It is less dense than air at a given temperature and pressure.
Air contains mostly and . The molar mass of carbon dioxide is , so carbon dioxide is more dense than air. The other statements are true and are not correct choices.