Question

Dimethylglyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in

• A. red precipitate
• B. blue precipitate
• C. yellow precipitate
• D. no precipitate

Answer 1

The correct option is A red precipitate

$DMG$ forms a complex of red colour with $N{i}^{2+}$ ions and not metallic $Ni$.
$N{i}^{2+}+2C_4{H}_8{N}_2{O}_2\to Ni(C_4{H}_7{N}_2{O}_2{)}_2+2H^{+}\text{red precipitate}$