Q.29 Boiling point is the temperature at which -
(A) vapour pressure < atmospheric pressure
(B) vapour pressure – atmospheric pressure
(C) vapour pressure > atmospheric pressure
(D) vapour pressure -2 atmospheric pressure
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Answer:
(C) vapour pressure > atmospheric pressure
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The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).
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