Question

(a) What is a redox reaction? Explain with an example.
(b) When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?
(c) In the reaction represented by the equation
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
(i) name the substance oxidised.
(ii) name the oxidising agent.
(iii) name the substance reduced.
(iv) name the reducing agent.

Answer 1

Explanation:

(a) Redox reaction:

The redox reaction involved taking place of reduction and oxidation reaction simultaneously. In this reaction, one element/compound undergoes oxidation reaction and another element/compound undergoes reduction reaction.  

(b) Chemical reaction:

$2 M g_{(s)}+O_{2(g)} \rightarrow 2 M g O_{(s)}$

The magnesium reacts with oxygen to form magnesium oxide. In this reaction, oxidation is involved. The magnesium (undergoes oxidation) losses electrons to combine with oxygen and form magnesium oxide.

(c) Chemical reaction:

Magnesium dioxide + Hydrochloric acid → Magnesium chloride + Water + Chlorine

(i) The substance oxidised is chlorine (Cl).  

(ii) The oxidising agent is magnesium dioxide $(MnO_2)$.

(iii) The substance reduced is magnesium chloride$(MnCl_2)$.

(iv) The reducing agent is hydrochloric acid (HCl).

You can get all the answers of Chapter 1 in the link below:

https://brainly.in/question/13848082

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Answer 2

Answer:

Explanation:(a) Redox reaction:

The redox reaction involved taking place of reduction and oxidation reaction simultaneously. In this reaction, one element/compound undergoes oxidation reaction and another element/compound undergoes reduction reaction.  

(b) Chemical reaction

The magnesium reacts with oxygen to form magnesium oxide. In this reaction, oxidation is involved. The magnesium (undergoes oxidation) losses electrons to combine with oxygen and form magnesium oxide.

(c) Chemical reaction:

Magnesium dioxide + Hydrochloric acid → Magnesium chloride + Water + Chlorine

(i) The substance oxidised is chlorine (Cl).  

(ii) The oxidising agent is magnesium dioxide .

(iii) The substance reduced is magnesium chloride.

(iv) The reducing agent is hydrochloric acid (HCl).

You can get all the answers of Chapter 1 in the link below:

brainly.in/question/13848082