Question

Name the substances oxidized, reduced, oxidizing agent and reducing agent in the following reactions:
(c) H2S + HNO3 - > NO + S + H2O
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Answer 1

Oxidised substance: H2S

Reduced substance: HNO3

Oxidising agent:. HNO3

Reducing agent:. H2S

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Answer 2

Answer:

Oxidized substance - H₂S

Reduced substance- HNO₃

Oxidizing agent- HNO₃

Reducing agent - H₂S

Explanation:

• Oxidation is the addition of oxygen or removal of hydrogen or loss of electrons from a molecule.
• Reduction is the addition of hydrogen or removal of oxygen or gain of electrons by a molecule.
• The substance undergoes the oxidation could be the reason of reduction of another substance in the reaction. Therefore, that substance is called a reducing agent.
• The substance which is being reduced, is an oxidizing agent.

The given reaction is :

H₂S  +  HNO₃ $\longrightarrow$ NO + S + H₂O

The oxidation of H₂S into S, because oxidation state of S changes from -2 to zero. So, H₂S is oxidized substance and acts as a reducing agent.

The HNO₃ is reduced into NO. Because oxidation state of N changes from +3 to +2.  Therefore   HNO₃ is reduced  and acts as a oxidizing agent.