Question

What will be obtained when managanese dioxide is fused with KOH in presence of oxidizing agent like KNO₃ ? What will be the colour of product ?

(A) K₂ MnO₄ Dark green 

(B) KMnO₄ , Violet 

(C) Mn₂O₃ , Grey 

(D) Mn₂O₄ , Black

Answer 1

(A) K₂ MnO₄ Dark green

Answer 2

Hey mate!!

→MnO2 + KOH + O2 __(KNO3)___________> K2MnO4(green)

° which on further hydrolysis in H+ 

K2MnO4 + H+ .........> KMnO4(purple)

Answer 3

Hey mate!!

→MnO2 + KOH + O2 __(KNO3)___________> K2MnO4(green)

° which on further hydrolysis in H+ 

K2MnO4 + H+ .........> KMnO4(purple)

So, your answer is option (A)