Question

Which of the statements about the reaction below are incorrect?
2PbO(s) + C(s) → 2Pb(s) + CO2(g)
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidised.
(c) Carbon is getting oxidised.
(d) Lead oxide is getting reduced.
(i) (a) and (b)
(ii) (a) and (c)
(iii) (a), (b) and (c)
(iv) all


NCERT Class 10th Science Chapter 1 Chemical Reactions and Equations

Answer 1

Explanation:

option 1

a and b are incorrect

Answer 2

Statements (a) and (b) are false for the given reaction.

• A substance is said to be oxidized if:

1. Oxygen is added to it or,
2. Electrons are removed from it.

• A substance is said to be reduced if:

1. Oxygen is removed or
2. Electrons are added to it.

• In the given reaction, Lead oxide loses oxygen to form elemental lead. So lead oxide is being reduced, not lead. Hence, statement  (a) is false.
• Similarly, oxygen is added to the carbon atom. So carbon is getting oxidized, not carbon dioxide. Carbon dioxide is the product formed on the oxidation of carbon. So, statement (b) is false.