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Potassium manganate `(K_2MnO_4)` is formed when
A. chlorine is passed into aqueous `KMnO_(4)` solution
B. manganese dioxide is fused with potassium hydroxide in air
C. formaldehyde reacts with potassium permanganate in presence of a strong alkali
D. potassium permanganate reacts with conc. Sulphuric acid

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Correct Answer - B::C
`2MnO_(2)+4KOH+O_(2)overset("heat")(rarr)2K_(2)MnO_(4)+2H_(2)O,`
`2KOH+HCHO+2KMnO_(4)rarrK_(2)MnO_(4)+H_(2)O+HCOOH`

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