Answer:
(i) \[KMn{{O}_{4}}\]: \[K(+1);\,Mn\,(+7)\,;\,\,O(-2)\]
(ii) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]:
\[K(+1);\,Cr\,(+6)\,;\,O\,(-2)\]
(iii) \[KCl{{O}_{4}}\]: \[K(+1)\,;\,Cl\,(+7);\,O\,(-2)\]
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