Among the following cations, the one that is precipitated as its chloride by dilute HCl in the systematic analysis is

A $Pb X^{2 +}$
B $Bi X^{3 +}$
C $Cd X^{2 +}$
D $Cu X^{2 +}$

Answer: A

Dilute HCl is the group I reagent. Lead(II) chloride is sparingly soluble in cold water and separates as a white solid, whereas the chlorides of Cu(II), Cd(II) and Bi(III) stay in solution. Hence

Pb X^{2 +}

Practice Qualitative Analysis: Cations More on Group I and group II cations (Pb, Cu, Bi, Cd, As, Sb, Sn)

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