Q.

In the condensation of a gas the mean kinetic energy (K) and potential energy ( U) of molecules change; thus:

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a

K decreases, U decreases

b

K increases, U keeps constant

c

K keeps constant, U decreases

d

K decreases, U increases

answer is C.

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Detailed Solution

internal energy of a liquid is less than that of a gas hence it will be decreased while k remains constant as condensation takes place at touch.

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