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Subject Test Chemistry

Question 13 of 17

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SAT Subject Test

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.

Correct Answer: 
No

It is used to extinguish fires.

Correct Answer: 
No

It dissolves in water at room temperature.

Correct Answer: 
No

It sublimes rather than melts at 20 degree text C end text and 1 atmosphere pressure.

Correct Answer: 
No

It is less dense than air at a given temperature and pressure.

Correct Answer: 
Yes

Air contains mostly text N end text subscript 2 end subscript left parenthesis text molar mass 28 g/mol end text right parenthesis and text O end text text end text subscript 2 end subscript left parenthesis text molar mass 32 g/mol end text right parenthesis. The molar mass of carbon dioxide is 44 text  g/mol end text, so carbon dioxide is more dense than air. The other statements are true and are not correct choices.

Question Difficulty: 
medium