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30 gms of water at 30oC is in a beaker. Which of the following, when added to water, will have greatest cooling effect? (Specific heat of copper = 0.1 cal/gmoC)

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a

100 gms of water at 10oC

b

15 gms of water at 0oC

c

3 gms of ice at 0oC

d

18 gms of copper at 0oC

answer is A.

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Detailed Solution

Since 'ms' is maximum for 100gm of water, amount of heat taken by 100g of water at 100 C will be maximum so it will have greatest cooling effect

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30 gms of water at 30oC is in a beaker. Which of the following, when added to water, will have greatest cooling effect? (Specific heat of copper = 0.1 cal/gmoC)