Question

Assertion :No yellow precipitate is formed when an excess of a more concentrated $(6$ M$)$ solution of $KI$ is added to a solution containing $P{b}^{2+}$ions. Reason: Yellow precipitate of $Pb{l}_2$ does not dissolve in excess of dilute solution of $KI$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is incorrect but Reason is correct
• D. Both Assertion and Reason are correct

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Yellow precipitate of $Pb{I}_2$ does not dissolve in excess of dilute solution of $KI$, as the reaction is reversible and shifts in backward direction on dilution with water.
$Pb{I}_2+2I^{-}\rightleftharpoons {\left[Pb{I}_4\right]}^{2-}$