MCQ
A Grignard's reagent may be made by reacting magnesium with
- AMethyl amine
- BDiethyl ether
- ✓Ethyl iodide
- DEthyl alcohol
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$3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4OH^-$
The reaction can go to completion by removing $OH^-$ ions by adding
$(I)$ $CrO_4^{2-}$
$(II)$ $MnO_4^-$
$(III)$ $Cr_2O_7^{2-}$ ?
