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JEE Main levelOne or more correct optionsDifficulty 2 of 3qc088

Which reagents can be used to distinguish $Ni X^{2 +}$ from $Co X^{2 +}$ in the same dilute solution?

A $H X_{2} S$ in presence of dilute $HCl$
Bsolid $NH X_{4} SCN$ and amyl alcohol
C $KNO X_{2}$ and acetic acid
Ddimethylglyoxime in ammoniacal solution

Answer: B, C, D

DMG gives red precipitate only with Ni;

NH X_{4} SCN

/amyl alcohol gives a blue organic layer only with Co;

KNO X_{2}

/acetic acid gives yellow

K X_{3} [Co (NO X_{2}) X_{6}]

only with Co.

H X_{2} S

in dilute HCl precipitates neither, so it cannot distinguish them.

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