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  4. Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia.

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Q. Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia.

IIT JEEIIT JEE 1985Organic Chemistry – Some Basic Principles and Techniques

Solution:

$ZnS$ is soluble in dil. $HCl$ but $CuS$ does not dissolve in dil. $HCl$.