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Question

Ice starts forming in lake with water at 0 C and when the atmospheric temperature is 10 C . If the time taken for 1 cm of ice be 7 hours, then the time taken for the thickness of ice to change from 1 cm to 2 cm is

A
7 hours
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B
14 hours
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C
Less than 7 hours
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D
More than 7 hours
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Solution

The correct option is C More than 7 hours
As the thickness of ice increases, the the rate of heat loss from water through ice decreses hence the rate of formation of ice will decrease with increasing thickness of ice

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