Question

Assertion : $PbC{l}_2$ is more stable than $PbC{l}_4$.
Reason: $PbC{l}_4$ is powerful oxidising agent.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (B)

$P{b}^{2+}$ is more stable than $P{b}^{4+}$ due to inert pair effect. Due to this reason $PbC{l}_4$ decomposes very readily into $PbC{l}_2$ and $C{l}_2$.
$PbC{l}_4(s)⟶PbC{l}_2(s)+C{l}_2(g)$
$P{b}^{4+}+2e^{-}⟶P{b}^{2+}$
$2C{l}^{-}⟶C{l}_2+2e^{-}$
Thus, $P{b}^{4+}$ salts are better oxidising agents.