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Q .     A piece of ice (heat capacity = 2100 J kg^-1°C^-1 and latent heat = 3.36 ×105 J kg^-1) of mass m grams is at -5°C at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally when the ice-water mixture is in equilibrium, it is found that 1 gm of ice has melted. Assuming there is no other heat exchange in the process, the value of m is

JEE 2010 Mains
A

0

B

7

C

8

D

5

HINT

Heat required to temperature rise + Heat required to melt 1gm of ice = 420J
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