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Most combination reactions release a large amount of heat. They are therefore described as:
Aendothermic
Bexothermic
Cphotolytic
Delectrolytic
Answer & Solution
Correct answer: B. exothermic
1. Combination reactions involve the formation of new bonds.
2. Bond formation releases energy in the form of heat.
3. A reaction that releases heat is exothermic; one that absorbs heat is endothermic, so endothermic is wrong.
4. Therefore most combination reactions are exothermic.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Combination reactions", p.146_
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