MCQ
$K_2MnO_4$ can be converted into $KMnO_4$ by
- APassing $CO_2$ gas
- BPassing $Cl_2$
- CElectrolytic oxidation
- ✓All of these
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$A$. The chromate ion is square planar.
$B$. Dichromates are generally prepared from chromates.
$C$. The green manganate ion is diamagnetic.
$D$. Dark green coloured $\mathrm{K}_2 \mathrm{MnO}_4$ disproportionates in a neutral or acidic medium to give permanganate.
$E$. With increasing oxidation number of transition metal, ionic character of the oxides decreases.
Choose the correct answer from the options given below:


(At. nos. $Cr = 24, Mn = 25, Fe = 26, Co = 27$)