Question

White ppt of $AgCl$ and ${PbCl}_2$ can be separated using :

• A. ${aqNH}_3$
• B. hot water
• C. both (a) and (b)
• D. None of these

Answer 1

The correct option is C both (a) and (b)

Silver chloride is soluble in dilute ammonia solution as it forms soluble complex $Ag(N{H}_3{)}_{2}Cl$.
$AgCl+2N{H}_{4}OH\to Ag\left(N{H}_3{)}_{2}Cl\right(solublecomplex)+2H_{2}O$.
On the other hand, lead chloride is insoluble in dilute ammonia solution.
Thus aqueous ammonia can be used for the separation of silver chloride and lead chloride.
Also lead chloride is soluble in hot water whereas silver chloride is insoluble in hot water.
Hence, hot water can be used for the separation of silver chloride and lead chloride.

Option C is correct.