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Standard XII

Chemistry

Types of Redox Reactions

When a piece ...

Question

When a piece of sodium metal is dropped in water, hydrogen gas evolved because:

sodium is reduced and acts as an oxidising agent

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water is oxidised and acts as a reducing agent

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sodium loses electrons and is oxidised while water in reduced

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water loses electrons and is oxidised to hydrogen

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Solution

The correct option is C sodium loses electrons and is oxidised while water in reduced
Reaction of sodium metal with water results in the evolution of hydrogen gas and formation of sodium hydroxide as:

$2 0 N a + 2_{2} O ⟶ 2 + 1 N a O H +_{2}$

Thus, the metal (Na) gets oxidized by lossing one electron and water gets reduced to hydrogen gas by gaining electron.

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Similar questions

Why if a substance loses hydrogen is said to be oxidised and if gains Hydrogen then reduced?

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}

(i)

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.

Choose the correct answer from the choices (a), (b), (c) and (d):
(i) The property which is characteristic of an electrovalent compound is that:
(a) it is easily vaporized
(b) it has a high melting point
(c) it is a weak electrolyte
(d) it often exists as a liquid.

(ii) When a metal atom becomes an ion:
(a) it loses electrons and is oxidised
(b) it gains electrons and is reduced
(c) it gains electrons and is oxidised
(d) it loses electrons and is reduced.

Q. In the following reactions, identify the oxidising agent and the reducing agent.

4 H C l + M n O_{2} \to M n C l_{2} + 2 H_{2} O + C l_{2}

Q. Explain why

H N O_{3}

acts only as oxidising agent while

H N O_{2}

can act both as a reducing agent and an oxidising agent?

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