Why Ni (||) compounds are thermodynamically more stable than Pt (||)

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Solution

$N i (I I) c o m p o u n d s a r e t h e r m o d y n a m i c a l l y m o r e s t a b l e t h a n P t (I I) c o m p o u n d s . T h e r e a s o n i s t h e s u m o f t h e f i r s t t w o i o n i s a t i o n e n e r g y o f n i c k e l i s t h a n P t (I I) c o m p o u n d s . F o r n i c k e l t h e v a l u e = 2.49 \times 10^{3} F o r p l a t i n u m t h e v a l u e = 2.66 \times 10^{3}$

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