(i) Give an example for a combination reaction which is exothermic.
(ii) Identify oxidising agent, reducing agent in the following reaction:
H₂S + Cl₂ → 2HCl + S

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Solution

Dear Student,

a) Combination reaction:

Formation of water from hydrogen and oxygen is of course a combination reaction where the hydrogen burns in presence of oxygen gas and releases a huge amount of energy and so it is an exothermic reaction.

2H₂ + O₂ --> 2H₂O

b) $H_{2} S + C l_{2} \to 2 H C l + S$

Oxidizing Agent - Cl₂ (as it oxidizes H₂S to S)

Reducing Agent - H₂S (as it reduces Cl₂ to HCl)

Regards

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