Question

Statement 1:$Pb{I}_4$ is a stable compound
Statement 2: $P{b}^{2+}$ ions with concentrated solution of $KI$ forms a soluble complex

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
• B. Ifboth Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true.

Answer 1

Answer: (D)

Statement 1: $P{b}^{+4}\stackrel{+2e}{\to }P{b}^{2+}$ (due to inert pair effect)
$2I^{-}\stackrel{I_2}{\to }(I^{-}$ acts as a reducing agent) so $Pb{I}_4$ is not a stable compound.
Statement 2: $P{b}^{2+}+4I^{-}\to [Pb{I}_4{]}^{-}$