SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

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 un melted. The amount of ice added to the water was close to (specific heat of water =4.2 J/g/°c) Specific heat of Ice=2.1 J/g/°C Heat of fusion of water at 0°C = 334 J/g)

(a)

50g

(b)

40g

(c)

60g

(d)

100g


Question ID - 50308 :-

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 un melted. The amount of ice added to the water was close to (specific heat of water =4.2 J/g/°c) Specific heat of Ice=2.1 J/g/°C Heat of fusion of water at 0°C = 334 J/g)

(a)

50g

(b)

40g

(c)

60g

(d)

100g

1 Answer
5876 Votes
3537

Answer Key : (b) -

Let amount of ice is m gm.

According to principal of calorimeter

Heat taken by ice=heat given by water

∴20×2.1×m+(m−20)×334 = 50×4.2×40

376 m=8400+6680

M=40.1

∴correct answer is (b)



Next Question :

In the figure shown below, the charge on the left plate of the 10  capacitor is −30? The Charge on the right plate of the 6  capacitor is

(a)

−18 μC

(b)

−12 μC

(c)

+12μC

(d)

+18 μF


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