CBSE Class 10 Science 2018 · Paper 31/1/C · Question 6

Chemical Reactions and Equations 3 marks Medium

In the reaction :

MnO_{2} + 4 HCl \to MnCl_{2} + 2 H_{2} O + Cl_{2}

(a) Name the compound

Answer

$HCl$ is oxidised (loses hydrogen) and $MnO_{2}$ is reduced (loses oxygen); oxidation is gain of oxygen or loss of hydrogen, reduction the reverse.

(a) (i) Compound oxidised: hydrogen chloride (hydrochloric acid),

HCl

; it loses hydrogen and is converted to chlorine,

Cl_{2}

. (ii) Compound reduced: manganese dioxide,

MnO_{2}

; it loses oxygen and is converted to

MnCl_{2}

. (b) Oxidation is the gain of oxygen or the loss of hydrogen by a substance; in this reaction

HCl

loses hydrogen, so it is oxidised. Reduction is the loss of oxygen or the gain of hydrogen by a substance; in this reaction

MnO_{2}

loses oxygen, so it is reduced.

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