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Potassium manganate (K2MnO4) is formed w...

Potassium manganate `(K_2MnO_4)` is formed when

A

potassium permanganate reacts with formaldehyde in acidic medium

B

Manganese dioxide is fused with potassium hydroxide in air.

C

Manganese hydroxide reats with `K_(2)O_(2)` in alkaline medium.

D

Potassium permanganate is heated at 750K

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
(A) `5HCHO+MnO_(4)^(-)+6H^(+)to2Mn^(2+)+5HCOOH+3H_(2)O`
(B) `4KOH+2MnO_(2)("Manganese dioxide")+O_(2)to2K_(2)MnO_(4) ("potassium manganate")+2H_(2)O`
(C) `Mn(OH)_(2)+O_(2)^(2-)toMnO_(4)^(2-)("Mangnate")+MnO_(2)+O_(2)`.
(D) `2KMnO_(4)overset(750K)toK_(2)MnO_(4)` (potassium mangnate) `+MnO_(2)+O_(2)`.
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