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Pure water cooled to - 15°C is contained in a thermally insulated flask. Some ice is added into the flask. The fraction of water frozen into ice is :
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Correct option is B
Here if m is the mass of ice and M is the mass of water, then 80 m = m × 0.5 × 15 + (M-m) × 1 × [0-(-15)]= m × 7.5 +15 M - 15mor mM=635∴Correct choice is (2).Similar Questions
10 g of ice at -20°C is dropped into a calorimeter containing 10 g of water at l 0°C; the specific heat _of water is twice that of ice . When equilibrium is reached,· the calorimeter will contain:
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