alleryA process or reaction in which heat is absorbed from the surroundings is called:
Aexothermic
Belectrolytic
Cendothermic
Dcatalytic
Answer & Solution
Correct answer: C. endothermic
1. Classification depends on whether heat is taken in or given out.
2. When heat is absorbed from outside, the process or reaction is endothermic, e.g. dissolution of KNO$_3$ in water.
3. Heat being given out defines an exothermic change, the opposite.
4. Electrolytic and catalytic refer to electricity and catalysts, not to heat exchange, so they are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.48_
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