Consider the following unbalanced redox reaction:
`H_(2)O+AX+BYrarrHA+OY+X_(2)B`
The oxidation number of `X` is `-2` and niether `X` nor water is involved in the redox process.
If the above reaction is balanced with smallest whole number coefficients, the sum of the stoichiometric coefficients of all the compound is

Options

A. `9`
B. `8`
C. `7`
D. `6`

Answer

B

Explanation

`A^(2+)+cancel(H^(o+))+cancel(3e^-)rarrHA]xx2`
`ul(BY+H_(2)OrarrB^(4+)+OY+cancel(2H^(o+))+cancel(6e^(-)))`
`2A^(2+)+BY+H_(2)Orarr2HA+B^(4+)+OY`
or
`(2AX)/(2)underset(+)+(BY)/(1)underset(+)+(H_(2)O)/(1)underset(+)+(2HA)/(2)underset++(BX_(2))/(1)underset++(OY)/(1)=8`
The sum of all the coefficients is `8`.