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(a) Give an example for a combination re...

(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.

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