Once the boiling starts, why does the temperature not rise accordingly even when heat is supplied?

Heat is used in killing germs.

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Heat is used in the heating vessel.

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Heat is used in the change of state.

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Both a and b

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Solution

The correct option is C
Heat is used in the change of state.

Once the boiling starts, the temperature does not rise accordingly even when heat is supplied because all the supplied heat is utilised in the change of state. Hence all the excess of heat supplied will be contained in the steam at the same temperature.

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