In order to boil water at 110°C, external pressure should be _____?
  1. 665 - 670 torr
  2. 660 - 700 torr
  3. 200 - 760 torr
  4. 760 - 1200 torr
Explanation

To boil water at 110°C, the external pressure must be higher than normal atmospheric pressure (760 torr), typically in the range of 760 - 1200 torr. 

This increased pressure raises the boiling point of water above its standard boiling point of 100°C.

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