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Redox Reactions

Consider a re...

Question

Consider a reaction :

$F e_{2} O_{3} (s) + 2 A l (s) \to A l_{2} O_{3} (s) + 2 F e (s)$

Choose the correct options :

A

F e_{2} O_{3}

is a reducing agent.

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B

A l

is a reducing agent.

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C

F e_{2} O_{3}

is an oxidising agent.

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D

A l

is an oxidising agent.

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Solution

The correct options are
B $A l$ is a reducing agent.
C $F e_{2} O_{3}$ is an oxidising agent.
Oxidising agent :

Substance which oxidises others and itself gets reduced.

Reducing agent :

Substance which reduces others and itself gets oxidised.

$+ 3 F e_{2} O_{3} (s) + 2 0 A l (s) \to + 3 A l_{2} O_{3} (s) + 2 0 F e (s)$
In the above reaction we can see that $F e$ in gets reduced from $+ 3$ to $0$ and $A l$ gets oxidised from $0$ to $+ 3$
$A l$ reduces $F e$ and itself gets oxidised so it is called reducing agent, while $F e_{2} O_{3}$ oxidises $A l$ and itself gets reduced , so it is called an oxidising agent.

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Similar questions

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

F e_{2} O_{3}

3 C O

2 F e

3 C O_{2}

F e_{2} O_{3}

acts as an oxidising agent and

C O

as a reducing agent.
(ii)

F e_{2} O_{3}

acts as a reducing agent and

C O (s)

as an oxidising agent.
(iii)

F e_{2} O_{3}

is being reduced while

C O

is being oxidised.
(iv)

F e_{2} O_{3}

is being oxidised while

C O

is being reduced.

Q. In the reaction,

H_{2} O (steam) + C \to C O + H_{2}

.
Which of the following is true?

Q. In the reaction,

F e_{2} O_{3} + 2 A l \to 2 F e + A l_{2} O_{3} +

h e a t

, the substance that is oxidised is ____________ and the substance that is reduced is _____________.

Q. In the following reaction, the correct statements are:

M g + 2 H^{+} \to M g^{2 +} + H_{2}

M g

is a reducing agent,

H^{+}

is an oxidising agent.
2.

M g

is oxidising agent,

H^{+}

is a reducing agent.

Question 6

Consider the reactions

(i) $H_{2} O_{2} + 2 H I \to I_{2} + 2 H_{2} O$
(ii) $H O C l + H_{2} O_{2} \to H_{3} O^{+} C l^{-} + O_{2}$

Which of the following statements is correct about $H_{2} O_{2}$ with reference to these reactions? Hydrogen peroxide is ........

(a) an oxidising agent in both (i) and (ii)

(b) an oxidising agent in (i) and reducing agent in (ii)

(c) a reducing agent in (i) and oxidising agent in (ii)

(d) a reducing agent in both (i) and (ii)

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Redox Reactions

Standard XII Chemistry

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