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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Practical Chemistry

Olympiad workbook · NSEC · Practical Chemistry

In qualitative inorganic analysis of a water-soluble salt mixture...

In qualitative inorganic analysis of a water-soluble salt mixture (salt

\mathrm{AB}+

salt XY ) both the cations were identified as sulphides. In the tests for anions sodium carbonate extract when treated with

\mathrm{AgNO}_3

gave yellowish precipitate soluble with difficulty in

\mathrm{NH}_4 \mathrm{OH}

while the other anion can be confirmed with brown ring test. (Given

\mathrm{K}_{\text {sp }}

for

\mathrm{AS}=1 \times 10^{-44}

and

\mathrm{XS}=1.4 \times 10^{-24}

). Identify the INCORRECT statement about the analysis.

Options

A $\mathrm{H}_2 \mathrm{~S}$ can be used under appropriate conditions of pH to separate and identify the cations.
BCation A will be precipitated under acidic condition as the concentration of sulphides ions required is low.
CThe anions are $\mathrm{NO}_3^{-}$ and $\mathrm{Cl}^{-}$ .
DCation X will be precipitated as sulphides under alkaline condition, as the concentration of sulphides ions required is very high.

Correct answer

C. The anions are $\mathrm{NO}_3^{-}$ and $\mathrm{Cl}^{-}$ .

Step-by-step solution

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