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In the temperature of air above a pond is 8?C thermal conductivity of ice is 0.005 C.G.S. units, latent heat of fusion of ice is 79.9 cal/gram the density of ice is 1 gm/cu.m, the time taken for the formation of ice layer of 1 cm thickness is

[A].	200 seconds	[B].	100 seconds
[C].	12.5 seconds	[D].	10 seconds
[E].	None of the above

Answer: Option C

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