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Potassium manganate `(K_2MnO_4)` is formed when

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Potassium manganate `(K_2MnO_4)` is formed when
A. Chlorine is passed through aqueous `KMnO_4` solution
B. Magnanese dioxide is fused with potassium hydroxide in air
C. Formaldehyde reacts with potassium
D. Potassium permaganate reacts with `H_2SO_4`
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Correct Answer - b,c
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