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Question

If 10 gram of ice at 0C is mixed with 10 gram of water at 40C. The final mass of water in mixture is
(Latent heat of fusion of ice =80cal/gm; specific heat of water =1cal/gmC)
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A
10 gram
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B
15 gram
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C
18 gram
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D
20 gram
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Solution

The correct option is B 15 gram
Heat water can release =10×1×40=400cal
Heat required by ice to melt =800cal[80×10]
heat release is less than heat required
So, water left = ice melts + log of water
=40080+10g=15gm

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