When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :
(a) rises very slowly
(b) rises rapidly until steam is produced
(c) first rises and then becomes constant
(d) does not rise at all

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Solution

(d) Does not rise at all

Temperature of the water during vaporisation does not change at all because the heat is used in overcoming particle-particle attraction forces, which in turn keeps the temperature constant.

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