Question

3) In redox reactions oxidation and reduction
Occur .........​

Answer 1

Answer:

It is a chemical reaction that involves a transfer of electrons between two species.

Answer 2

In redox reaction oxidation and reduction occur simultaneously.

The examples are

• Image(i)

The Copper(II) oxide is losing oxygen and being reduced. Whereas, oxygen is added to hydrogen and is being oxidized.

• Image(ii)

In this reaction, HCl is oxidized to Cl₂ whereas, MnO₂ is reduced to MnCl₂

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⇒ Oxidation reaction:

The process where oxygen is added or hydrogen is removed from a substance. Or

The process in which a substance loses an electron/electrons.

Examples

$\boxed{\rm{2Cu+O_{2} \longrightarrow 2CuO}}$

By giving heat.

Cu = Copper

O₂ = Oxygen

CuO = Copper Oxide

• Another example

$\boxed{\rm{2H_{2}S+O_{2} \longrightarrow 2S + 2H_{2}O}}$

Here,

H₂S = Hydrogen Sulphide

O₂ = Oxygen

S = Sulphur

H₂O = Hydrogen Oxide

• Also,

$\boxed{Zn \longrightarrow Zn^{2+} + 2e^{-}}$

Zn = Zinc

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Now,

⇒ Reduction reaction:

The process in which oxygen is removed or hydrogen is added to a substance. OR

The process in which a substance gains an electron/electrons.

Examples

$\boxed{2Na+H_{2} \longrightarrow 2NaH}$

Here,

Na = Sodium

H₂ = Hydrogen

NaH = Sodium Hydride

• Also,

$\boxed{Zn^{2+}+2e^{-}\longrightarrow Zn}$

Zn = Zinc