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The water equivalent of a calorimeter is...

The water equivalent of a calorimeter is 10g and it contains 50 g of water at `15^(@)C`. Some amount of ice, initially at `-10^(@)C` is dropped in it and half of the ice melts till equilibrium is reached. What was the initial amount of ice that was dropped (when specific heat of ice `=0.5"cal"gm^(-1)""^(@)C^(-1)` specific heat of water `=1.0"cal"gm^(-1)""^(@)C^(-1)` and laten heat of melting of ice `=80"cal"gm^(-1)`)?

A

10g

B

18g

C

20g

D

30g

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