AIIMS 2018 Chemistry Oxidation States MCQ Question
When lead nitrate react with nitric acid, it gives lead oxide. The reaction is shown below: Pb₃O₄ + HNO₃ → PbO₂ + Pb(NO₃)₂ + H₂O Lead is highly stable in +2 oxidation state than +4 oxidation state.
True, lead prefers +2 state.
False, lead prefers +4 state.
True, but only in acidic conditions.
False, it depends on the reaction.
Correct Answer
Detailed Explanation
Lead is generally more stable in the +2 oxidation state due to its lower energy and greater stability compared to the +4 state, especially in acidic conditions where lead can form stable complexes. In the presence of nitric acid (HNO₃), lead can oxidize to the +4 state, but this state is less stable and more reactive, leading to a preference for the +2 state under typical conditions. Option (A) is incorrect as it does not specify the conditions, while (B) is false because lead does not prefer the +4 state overall. Option (D) is misleading since the stability of lead's oxidation states is not solely reaction-dependent but also influenced by environmental factors.
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