Question 3

Which of the following statements about the given reaction are correct?

$3 Fe(s) + 4 H_{2} O(g) \to {Fe}_{3} O_{4} (s) + 4 H_{2} (g)$
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidizing agent

(a) (i), (ii) and (iii)
(b) (iii) and (iv)
(c) (i), (ii) and (iv)
(d) (ii) and (iv)

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Solution

Option (c) is correct.

The substance which oxidizes the other substance in a chemical reaction is known as an oxidizing agent. Likewise, the substance which reduces the other substance in a chemical reaction is known as reducing agent.

In the given reaction, water is getting reduced but it is oxidising iron to iron oxide. So, water is acting as an oxidising agent.

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Similar questions

Q. In which of the following reactions

H_{2} O_{2}

acts as a reducing agent?
i)

H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O

ii)

H_{2} O_{2} + 2 e^{-} \to O_{2} + 2 H^{+}

iii)

H_{2} O_{2} + 2 e^{-} \to 2 O H^{-}

iv)

H_{2} O_{2} + 2 O H^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O

Q. Identify the rate of reaction of given compounds in

E_{2}

reactions

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(i) $C H_{3} C H_{2} C H O$ (ii) $C H C l_{2} C H O$ (iii) $(C H_{3})_{3} C - C H O$ (iv) $C_{6} H_{5} C H O$

Question 10

Consider the list of terms given below:
(i) Tsunami
(ii) Landslides
(iii) Floods
(iv) Lightning
Earthquakes can cause
(a) (i), (ii) and (iii)
(b) (ii) and (iv)
(c) (ii), (iii) and (iv)
(d) (iii) and (iv)

Which of the following species can act both as Bronsted acid and base?
(I) $N H_{2}^{-}$ (II) $H C O_{3}^{-}$ (III) $A l C l_{3}$ (IV)All of these

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