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Q1:
Which of the statements about the reaction below are incorrect? $2PbO(s) + C(s) \rightarrow 2Pb(s) + CO_2(g)$ (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced.

Solution :

Step 1: Chemical Equation Analysis

The given chemical reaction is: $2PbO(s) + C(s) \rightarrow 2Pb(s) + CO_2(g)$

In this redox reaction, we must determine the movement of oxygen and the subsequent change in oxidation states of the reacting species [Per the definition of Oxidation-Reduction reactions].

Step 2: Evaluating Species Transformation

  • Lead (Pb): In the reactant side, lead exists as Lead(II) oxide ($PbO$). On the product side, it exists as elemental Lead ($Pb$). Since oxygen is being removed from lead, the process is reduction [Per the definition: reduction is the loss of oxygen]. Therefore, Lead oxide is getting reduced.
  • Carbon (C): In the reactant side, carbon exists as elemental Carbon ($C$). On the product side, it is converted to Carbon dioxide ($CO_2$). Since oxygen is added to carbon, the process is oxidation [Per the definition: oxidation is the gain of oxygen]. Therefore, Carbon is getting oxidised.

Step 3: Tabular Breakdown of Statements

Statement Analysis Status
(a) Lead is getting reduced The element undergoing reduction is $Pb$ within the $PbO$ compound, but the statement implies the element itself changes. Technically, $PbO$ is reduced. Incorrect
(b) Carbon dioxide is getting oxidised Carbon dioxide is the product of the oxidation of Carbon; $CO_2$ cannot be oxidised further in this context. Incorrect
(c) Carbon is getting oxidised Carbon gains oxygen to become $CO_2$. Correct
(d) Lead oxide is getting reduced $PbO$ loses oxygen to become $Pb$. Correct

Step 4: Visualizing the Redox Mechanism

2PbO + C → 2Pb + CO₂ Reduction (Loss of O) Oxidation (Gain of O)

Final Solution: The incorrect statements are (a) and (b).


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