Question

When $Mn{O}_2$ is fused with $KOH$, a coloured compound is formed. The product and its colour is:

• A. $K_{2}Mn{O}_4,$ green
• B. $KMn{O}_4,$ purple
• C. $M{n}_2{O}_3,$ brown
• D. $M{n}_3{O}_4,$ black

Answer 1

The correct option is A $K_{2}Mn{O}_4,$ green

When $Mn{O}_2$ is fused with $KOH$, a coloured compound is formed.

The reaction is as follows:

$4KOH+2Mn{O}_2+O_2\to 2K_{2}Mn{O}_4+2H_{2}O$

(green)

Hence, the product $K_{2}Mn{O}_4$ is formed which is green in colour.