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Q.

Two identical beakers labeled as (X) and (Y) contain of water each at . To the water in the beaker (X) 100 g of water at  was added and stirred to mix thoroughly. To the beaker (Y) 100 g of ice at  was added and stirred till it melted into water. The water in the beaker (Y) will be

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a

Hotter than water in beaker X

b

Colder than water in beaker X

c

Heavier than water in beaker X

d

Lighter than water in beaker X

answer is B.

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Detailed Solution

The water in the beaker Y is colder than the water present in beaker X. This is due to greater amount of heat energy is required for the fusion of 100 g of ice at  in beaker Y. Hence,100 g water at in beaker X has hotter  than 100 g of  ice at  in beaker Y.

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