Q46 / 180 · AIIMS 2018 (26 May) · Chemistry

Assertion : $\mathrm{Pb}_3 \mathrm{O}_4$ reacts with $\mathrm{HNO}_3$ and forms $\mathrm{PbO}_2$. Reason : Lead is stable in +4 oxidation state.

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

Solution

$\begin{aligned} & \mathrm{Pb}_3 \mathrm{O}_4+\mathrm{HNO}_3 \longrightarrow \mathrm{PbO}_2(\text { solid })+ \\ & \mathrm{Pb}\left(\mathrm{NO}_3\right)_2+\mathrm{H}_2 \mathrm{O}\end{aligned}$ but $\mathrm{Pb}^{2+}$ is more stable due to inert pair effect.

Hence, the correct answer is option: 'C'.

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