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12. The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

(a)  Attracted when x lies between A and B and are repelled when X lies between B and C

(b)   Attracted when x lies between B and C and are repelled when X lies between A and B

(c)   Attracted when they reach B

(d)   Repelled when they reach B

Answer-b

(10)

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