Question

Oxidation number of Mn in \( KMnO_4 \) is

• A. zero
• B. +2
• C. +4
• D. +7

Hint:

The oxidation state of Mn in \( KMnO_4 \) can be calculated using the sum rule: \( \text{Sum of oxidation states} = 0 \).

Answer 1

The Correct Option is D

Step 1: Let the oxidation number of Mn be \( x \) in \( KMnO_4 \). 

Step 2: Since \( K = +1 \) and \( O_4 = -8 \), the equation is: \[ 1 + x + (-8) = 0 \] \[ x = +7 \] Thus, the oxidation state of Mn in \( KMnO_4 \) is +7.