1.

Calculate the oxidation number of the underlined element in the following ions. ul(S)_(2)O_(3)^(2-)

Answer»

Solution :`S_(2)O_(3)^(2-)` : Let the oxidation number of each S atom in this ion be X. The SUM of oxidation NUMBERS of all the atoms PRESENT must be equal to the CHARGE present on this ion i.e., equal to -2.
Therefore,
`(x)xx2+(-2)xx3=-2`
or 2x=-2+6
or `x=(-2+6)/(2)=+2`
Hence, the oxidation number of S in `S_(2)O_(3)` ion is +2.


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