Question

(a) Give an example for a combination reaction which is exothermic.
(b) Identify the oxidising agent, reducing agent in the following reaction :
+C12—).2IICI4S
(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.


CBSE Class X Science SA 2 (3 Marks)

Answer 1

(a) Any suitable exothermic reaction like CaO + H20— Ca(OH)2+ Heat

(b) Oxidising agent CI2

Reducing agent H2S

Rancidity, keeping in airtight containers.