(a) Give an example for a combination reaction which is exothermic. (b) Identify the oxidising agent and reducing agent in the following reaction. `H_(2)S + Cl_(2) to 2HCl + S` (c) Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.

(a) Give an example for a combination reaction which is exothermic. (b

1.	(a) Give an example for a combination reaction which is exothermic. (b) Identify the oxidising agent and reducing agent in the following reaction. `H_(2)S + Cl_(2) to 2HCl + S` (c) Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.
Answer» (a) `CaO + H_(2)O to Ca (OH)_(2) + "heat"`. (b) `H_(2)S + Cl_(2) to 2HCl + S` Oxidising agent `Cl_(2)` , Reducing agent `H_(2)S`. (c) It is known as rancidity. Only food must be kept in air tight containers.

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