Question

Highest positive oxidation state shown by:

• A. Cl
• B. Os
• C. Mn
• D. Cr

Answer 1

The correct option is B Os

Osmium exhibits oxidation states from $0-+8$ in its compounds, with the exception of $+1$.

well-characterized and stable compounds contain the element in$+2,+3,+4,+6,$ and $+8$ states.

There are also carbonyl and organometallic compounds in the low oxidation states $-2,0,+1$.