Question

Highest oxidation state of $Mn$ is present in

• A. $KMnO_4$
• B. $K_2MnO_4$
• C. $Mn_2O_3$
• D. $MnO_2$

Answer 1

Answer: (A)

$KMnO_4$

Answer 2

Let the oxidation state of $Mn$ is $x$. (a) $KMnO _{4}+1+x+(-2) \times 4=0$ $x-7 =0$ $x =+7$ (b) $K _{2} MnO _{4} (+1) \times 2+x+(-2) \times 4=0$ $x-6=0$ $x=+6$ (c) $Mn _{2} O _{3} x \times 2+(-2) \times 3=0$ $2 x=+6$ $x=+3$ (d) $MnO _{2} x+(-2) \times 2=0$ $x=+4$ Thus, oxidation state of $Mn$ is highest in $KMnO _{4}$.