Maximum oxidation state is shown by

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(A) The transition elements exhibit variable oxidation states. Among the given options,$Os$ (Osmium) belongs to group $8$ and can exhibit a maximum ox

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$Os$

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(A) The transition elements exhibit variable oxidation states. Among the given options,$Os$ (Osmium) belongs to group $8$ and can exhibit a maximum oxidation state of $+8$ (e.g.,in $OsO_4$).$Mn$ (Manganese) shows a maximum oxidation state of $+7$ (e.g.,in $KMnO_4$).$Cr$ (Chromium) shows a maximum oxidation state of $+6$ (e.g.,in $K_2Cr_2O_7$).$Co$ (Cobalt) typically shows $+2$ and $+3$ oxidation states.Therefore,$Os$ shows the maximum oxidation state.

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