1.

Potassium manganate (K_2MnO_4) is formed . When:

Answer»

Cuprous oxide reacts with alkaline `KMnO_4` solution
Manganese dioxide is fused with `K_2CO_3` in PRESENCE of `KNO_3`
Formaldehyde reacts with POTASSIUM permanganate in presence of concentrated potassium hydroxide solution
Potassium permanganate is heated with potassium hydroxide

Solution :(A)`KMnO_4 +Cu_2O + KOH to 2CU(OH)_2 + K_2MnO_4`
(B)`2MnO_2 + 2K_2CO_3 + O_2 ("from" KNO_3) to 2K_2MnO_4 + 2CO_2`
(C )`HCHO + 2KMnO_4 + 2K_2MnO_4 + H_2O +HCOOH`
(D)`4KMnO_4+4KOH oversetDeltato4K_2MnO_4 +2H_2O + O_2`


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