JEE MAIN - Chemistry (2022 - 24th June Morning Shift - No. 12)
During the qualitative analysis of salt with cation y2+, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y2+) present respectively are :
Dimethylglyoxime and Ni2+
Dimethylglyoxime and Co2+
Nessler's reagent and Hg2+
Nessler's reagent and Ni2+
Explanation
On addition of dimethylglyoxime to alkaline solution of $\mathrm{Ni}^{+2}$, a bright red ppt. is obtained.
$\mathrm{Ni}^{+2}+2 \mathrm{dmg} \rightarrow\left[\mathrm{Ni}(\mathrm{dmg})_{2}\right]^{+2}$ (Bright red ppt)
$\mathrm{Ni}^{+2}+2 \mathrm{dmg} \rightarrow\left[\mathrm{Ni}(\mathrm{dmg})_{2}\right]^{+2}$ (Bright red ppt)
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