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JEE Main

Exam: JEE Main
Subject: Chemistry
Chapter: Practical Chemistry

JEE Main · Chemistry · Practical Chemistry

Passing H _ 2 S in to a mixture of Mn^ 2 + , Ni^ 2 + , Cu^ 2 + and...

Passing

{H}_{2}S

in to a mixture of

Mn^{2 +}, Ni^{2 +}, Cu^{2 +}

and

Hg^{2 +}

ions in an acidified aqueous solution precipitates

Options

A $MnS$ and $CuS$
B $CuS$ and $HgS$
C $NiS$ ad $HgS$
D $MnS$ and $NiS$

Correct answer

B. $CuS$ and $HgS$

Step-by-step solution

{H}_{2}S

in presence of aqueous solution precipitates sulphide of

Cu

and

Hg

(IInd group) apart from

\text{P}{\text{b}}^{+ 2}, \text{B}{\text{i}}^{+ 3}, \text{C}{\text{d}}^{+ 2}, \text{A}{\text{s}}^{+ 3}, \text{S}{\text{b}}^{+ 3}

and

\text{S}{\text{n}}^{+ 2}, \text{M}{\text{n}}^{2 +}, \text{N}{\text{i}}^{2 +}

are of IVth group so cannot be precipitated by

{H}_{2}S

.

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