The oxidation number of an element in a compound decides its nature to act as oxidant or reductant. Oxidation number is defined as the residual charge which an atom has or appears to have in a molecule when all other atoms are removed from the molecule as ions. Oxidation number is frequently used interchangebly with oxidation state. The stock notations of oxidation numbers are based on the periodic property - electronegativity. An atom in a molecule can be assigned positive, negative or zero oxidation number by considering its environment. In few cases, oxidation number can even be fractional.
Maximum oxidation state shown by Os, Ru and Xe in their compounds is :

Options

A. `+8`
B. `+6`
C. `+10`
D. `+4`

Answer

A

Explanation

In `OsO_4 and RuO_4 and XeO_6^(4-)`