Q.

Potassium manganate  K2MnO4 is formed when

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a

Formaldehyde reacts with potassium permanganate in presence- of a strong alkali 

b

 Manganese dioxide is fused with potassium hydroxide in air 

c

Potassium permanganate reacts with cone. sulphuric acid

d

Chloride is passed into aqueous  solution 

answer is B.

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Detailed Solution

2MnO2+4KOH+O2 heat 2K2MnO4+2H2O

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