A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking its temperature readings. He would observe that the temperature of water:

(1) keeps on increasing regularly

(2) keeps on increasing irregularly

(3) first increases slowly, then decreases rapidly and eventually becomes constant

(4) first increases gradually and then becomes constant

The correct option is D. During any phase transition i.e.  melting, boiling, freezing, etc the temperature of the system remain constant until all the substance changed into the other state. 
For reason please refer to the following link:
https://www.meritnation.com/ask-answer/question/for-any-substance-why-does-the-temperature-remain-constant/matter-in-our-surroundings/6290847
 

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4th option

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answer will be 4

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i want the reason also!!!!!!

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C d water would take sum time to reach its boiling point so it will continously absorb heat till den when it attains d boiling point it will use d heat to convert into vapours nd d heat will become latent heat so d temp.will remain constant wen it attains its boilind point as d heat will be used to break d force of attraction to becum gas

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