10 gm of ice at -20°C is dropped into a calorimeter containing 10 gm of water at 10°C. The specific heat of water is twice that of ice. Neglect heat capacity of the calorimeter. When equilibrium is reached, the calorimeter will contain :

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10 gm ice and 10 gm of water

20 gm of water

5 gm ice and 15 gm of water

20 gm ice

answer is A.

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Detailed Solution

Heat that can be given by water, till it reaches 0°C, Q1=10×S×10=100SHeat that can be taken by ice to reach 0°C,Q2=10×S2×20=100SQ1=Q2∴No ice melts and no water freezes.

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