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K(2)PtCl(6) compound whereas correspondi...

`K_(2)PtCl_(6)` compound whereas corresponding Ni compound is not known. Explain?

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The correct Answer is:
This is because `Pt^(4+)` is more stable than `Ni^(4+)` as the sum of four ionisation energies of Pt is less than those of Ni.
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