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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