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JEE Main 2022 · 25 Jun · Shift 2, Physics question 35

A copper block of mass 5.0 kg is heated to a temperature of 500°C and is placed on a large ice block. What is the maximum amount of ice that can melt?

[Specific heat of copper : 0.39 J g−1^{-1} °C−1^{-1} and latent heat of fusion of water : 335 J g−1^{-1}]

Choose one option
Answer and worked solution

Official answer: C

Heat from copper (cooling to 0°C): 5000×0.39×500=9750005000\times0.39\times500=975000 J.

Ice melted. 975000335≈2910\dfrac{975000}{335}\approx2910 g ≈2.9\approx2.9 kg.

(C)

Topics:Calorimetry and specific heatLatent heat and phase change
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