Question

What is the oxidation number of Mn in $K_2MnO_4$ ?

• A. $+5$
• B. $+6$
• C. $+7$
• D. $+4$

Answer 1

Answer: (B)

$+6$

Answer 2

Let the oxidation no. of $Mn$ be $x$. $K_2MnO_4$ $\Rightarrow 2+ x+ 4(-2) = 0$ $2 + x-8 = 0$ $\Rightarrow x = +6$