Question

Which of the following statements about the given reaction are correct?
3Fe(s) + 4H O(g) → Fe3O4(s) + 4H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(a) (i), (ii) and (iii) (b) (iii) and (iv)
(c) (i), (ii) and (iv) (d) (ii) and (iv)

NCERT Class X
Science - Exemplar Problems

Chapter_Chemical Reactions And Equations

Answer 1

the answer is C as an oxygen atom is getting attached to iron and an oxygen atom is taken away from hydrogen hence it is getting reduced.water is acting as an oxidizing agent as the oxygen is oxidizing iron.

C

Answer 2

Answer: (c) (i), (ii) and (iv)

Explanation:

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

$3Fe(s)+4H_2O(g)\rightarrow Fe_3O_4+4H_2$

On reactant side:

Oxidation state of iron = 0

Oxidation state of hydrogen = +2

On product side:

Oxidation state of iron = +2 and +3

Oxidation state of hydrogen= 0

The oxidation state of iron increases from 0 to +2 and +3, it is getting oxidized. Thus iron act as a reducing agent.

The oxidation state of hydrogen decreases from +2 to 0, it is getting reduced. Thus water act as oxidizing agent.