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1. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10-16 m2 . S-1 and it is 1.94 x 10-14 m2 S-1 at 1200 K. The activation energy (in k. J.mole-1 ) for the diffusion of Ni in Cu is
(A): 130
(B): 180
(C): 230
(D): 250
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