Question

Lead chloride and silver chloride can be separated by :

• A. filtration
• B. distillation
• C. qualitative analysis
• D. chromatography

Answer 1

The correct option is C qualitative analysis

Lead(II) chloride can be separated from silver chlorides based on its increased solubility.

At higher temperatures. This means that lead(II) chloride will dissolve in hot water, leaving the silver chloride in solid form:

$PbC{l}_2\left(s\right)\to P{b}^{2+}\left(aq\right)+2C{l}^{-}\left(aq\right)$

$A{g}^{+}$ cations can be separated by adding 6 M NH3 (aq) to the solid silver chloride.

Silver chloride will dissolve since it forms a soluble complex ion with ammonia.

$AgCl\downarrow +N{H}_3\to \left[Ag\right(N{H}_3{)}_2{]}^{+}+C{l}^{-}$

Option C is correct.