(a) Define the following in terms of gain or loss of hydrogen with one example each:(i) oxidation (ii) reduction(b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

Academic Chemistry NCERT Class 10

(a)$H_{2} S\ +\ Cl_{2} \ \rightarrow S\ +\ 2HCl$

(i) In the above reaction, hydrogen is removed from hydrogen sulphide. By definition, the removal of hydrogen from a compound is called oxidation, hydrogen sulphide is oxidised to sulphur.

(ii) On the other hand, hydrogen is added to chlorine. By definition, the addition of hydrogen to a substance is called reduction, chlorine is reduced to hydrogen chloride.

(b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide.

$2Mg\ +\ O_{2} \ \rightarrow \ 2MgO$

(i) Magnesium (Mg) is oxidised.

(ii) Oxygen (O₂) is reduced.

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Updated on: 10-Oct-2022

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