Q. 264.4( 13 Votes )

(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 oxidized 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 :

(a) Oxidation and reduction happening simultaneously in a reaction is called redox reaction.

In the above reaction, copper oxide is reduced to copper whereas hydrogen is oxidized to water.

(b)Magnesium is oxidized because oxygen is added to magnesium creating MgO which leads to the ribbon burning with dazzling flame

(c) MnO2 + 4HCl → MnCl2 + 2H2O +Cl2

(i) HCl is oxidized.

(ii)MnO2 is oxidizing agent.

(iii)MnO2 is getting reduced.

(iv) HCl is reducing  agent.

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