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Ice at –20°C is added to 50 g of water at 40°C. When the temperature of the mixture reaches 0°C, it is found that 20 g of ice is still unmelted. The amount of ice added to the water was close to (Specific heat of water = 4.2J/g/°C Specific heat of Ice = 2.1J/g/°C Heat of fusion of water at 0°C= 334J/g)

1. 100 g
2. 60 g
3. 50 g
4. 40 g

Correct answer: 40 g

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