Question

Which of the statements about the following reaction are incorrect?
\[2\text{PbO}\left( s \right)\text{ + C}\left( s \right)\text{ }\to \text{ 2 Pb}\left( s \right)\text{ + C}{{\text{O}}_{2}}\left( g \right)\]
a ) Lead is getting reduced.
b ) Carbon dioxide is getting oxidised.
c ) Carbon is getting oxidised.
d ) Lead oxide is getting reduced.

A ) (a) and (b)
B ) (a) and (c)
C ) (a), (b) and (c)
D ) All

Answer 1

Hint: Gain of oxygen is oxidation and loss of oxygen is reduction. Loss of hydrogen is oxidation and gain of hydrogen is reduction. Loss of electrons is oxidation and gain of electrons is reduction. Oxidation is an increase in the oxidation number. Reduction is a decrease in the oxidation number.

Complete step by step answer:
Lead(II) oxide reacts with carbon to form lead and carbon dioxide. Write the balanced chemical equation.

\[2\text{PbO}\left( s \right)\text{ + C}\left( s \right)\text{ }\to \text{ 2 Pb}\left( s \right)\text{ + C}{{\text{O}}_{2}}\left( g \right)\]

Gain of oxygen is oxidation and loss of oxygen is reduction.
Lead(II) oxide loses oxygen. Hence, it is reduced. The statement, “Lead oxide is getting reduced.” is the correct statement. Hence, option D ) All is ruled out.
Lead gains oxygen. Hence, it is oxidised. The statement, “Lead is getting reduced.” is incorrect.
Carbon gains oxygen. Hence, it is oxidised. The statement, “ Carbon dioxide is getting oxidised.” is the correct statement. Hence, the options B ) and C ) are ruled out.
Carbon dioxide loses oxygen. Hence, it is reduced. Hence, the statement, “Carbon dioxide is getting oxidised.” is incorrect.

Hence, the option A ) is correct i.e.(a) and (b) represents incorrect statements.

Note: Lead gains oxygen. Gain of oxygen is oxidation. Hence, lead is oxidised. The statement, “Lead is getting reduced.” is incorrect as lead is not reduced. Carbon dioxide loses oxygen. Loss of oxygen is reduction. Hence, carbon dioxide is reduced. Hence, the statement, “Carbon dioxide is getting oxidised.” is incorrect as carbon dioxide is reduced.