50g of ice at 0°C is mixed with 50g of water at 80°C, what will

50g of ice at 0°C is mixed with 50g of water at 80°C, what will be the final temperature of a mixture?
A. 0°C
B. 40°C
C. 60°C
D. 4°C

Right option is A. 0°C

To explain: Heat required to melt 50g ice = mL = 50×80=4000cal

Heat given out by water in cooling from 80°C to 0 = mc∆T=50×1×80=4000cal

Heat given by water is just sufficient to melt the whole ice. So the final temperature is 0°C.