P b ^ 2 + ,C u ^ 2 + ,Z n ^ 2 + and N i ^ 2 + ions are present in a...

\text{P}{\text{b}}^{2 +},\text{C}{\text{u}}^{2 +},\text{Z}{\text{n}}^{2 +}

and

\text{N}{\text{i}}^{2 +}

ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution, the available precipitate will contain

Options

A $\text{P}\text{b}\text{S}$ and $\text{N}\text{i}\text{S}$
B $\text{P}\text{b}\text{S}$ and $\text{C}\text{u}\text{S}$
C $\text{C}\text{u}\text{S}$ and $\text{Z}\text{n}\text{S}$
D $\text{C}\text{u}\text{S}$ and $\text{N}\text{i}\text{S}$

Correct answer

B. $\text{P}\text{b}\text{S}$ and $\text{C}\text{u}\text{S}$

Step-by-step solution

Pb²⁺ and Cu²⁺ are precipitated as sulphides because of their lower solubility products, where as sulphide of other metals remain in the solution because of their high solubility products.

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