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Questions  

When vapour condenses into liquid:

a
it absorbs heat
b
it liberates heat
c
its temperature increases
d
its temperature decreases

detailed solution

Correct option is B

Latent heat is released by vapour .

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A piece of ice falls from a height h, so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is (Take, latent heat of ice is 3.4 X 105 ]/kg and g = 10 N/kg) 


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