Question

In the given below, which ion cannot give iodometric titrations?

• A. $A{g}^{+}$
• B. $F{e}^{3+}$
• C. $P{b}^{2+}$
• D. $C{u}^{2+}$

Answer 1

Answer: (C)

Atom in highest oxidation state can oxidize iodide to liberate $I_2$ which is volumetrically measured by iodometric titration using hypo solution.
$2I^{-}\to I_2$
$P{b}^{+2}\to$ Lowest oxidation state can not oxidise iodide to $I_2$ .