Correct Answer: Option D

Explanation

HCl (hydrochloric acid) can be used to distinguish between Pb\(^{2+}\) and Al\(^{3+}\) because lead ions (Pb\(^{2+}\)) form a white precipitate (PbCl\(_2\)) when reacted with HCl, while aluminum ions (Al\(^{3+}\)) do not.

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