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GK QUESTION#3378

At approximately one atmosphere, which pairs give approximate normal boiling points?

I. Chloroform — 334 K

II. Methane — 111.7 K

  1. AOnly I
  2. BNeither I nor II
  3. COnly II
  4. DBoth I and IICorrect answer
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Answer

D. Both I and II

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Explanation

At approximately one atmosphere, chloroform boils near 334.3 K and methane near 111.7 K. Both listed approximate pairs are therefore correct. A normal boiling point is defined at a specified pressure; changing the external pressure changes the boiling temperature.

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