Q. Oxidation number of $M n$ in $M n O_{4}^{-}$ is

1875 261 Rajasthan PETRajasthan PET 2003 Report Error

A

5

B

6

C

7

D

4

Solution:

Let the oxidation number of $M n$ is $x$ in $M n O_{4}^{-}$ $x + 4 (- 2) = - 1$ $x - 8 = - 1$ $x = - 1 + 8 = 4 - 7$