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Question

A beaker contains 40 g of water at 20C. Now 50 g of ice is put into the beaker. The resulting temperature will be

A
7C
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B
0C
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C
10C
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D
1.5C
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Solution

The correct option is B 0C
Heat released by water at 20oC to 0oC =40×1×20=600cal
Heat required to melt 50g of ice into water =50×80cal=4000cal
Because required heat is much more than released heat so final temperature is 0oC.

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