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(i) How K(2)MnO(4) can be obtained from ...

(i) How `K_(2)MnO_(4)` can be obtained from `MnO_(2), KOH` and `KNO_(3)` ?
(ii) `K_(2)PtCl_(6)` is a well known compound whereas corresponding Ni compound is not known. State the reason for it .

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