A calorimeter contains 0.2 kg of water a...

A calorimeter contains `0.2 kg` of water at `30^(@)C 0.1 kg` of water at `60^(@)C` is added to it, the mixture is well stirred and the resulting temperature is found to be `35^(@)C`. The thermal capacity of the calorimeter is:

`"6300 J K"^(-1)`

`"1260 J K"^(-1)`

`"4200 J K"^(-1)`

`"3200 J K"^(-1)`

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