Question

what is a double displacement reaction with example .Also distinguish b/w endothermic and exothermic reaction

Answer 1

Double displacement reaction means the reaction which form precipitate during chemical reaction...
Endothemic reactions means heat is absorbed and exothermic means heat is taken away.
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Answer 2

Double displacement reactions may be defined as the chemical reactions in which one component each of both the reacting molecules is exchanged to form the products. During this reaction, the cations and anions of two different compounds switch places, forming two entirely different compounds.

The difference between endothermic and exothermic reactions lies in the words themselves. "Thermic" refers to heat, just as in the word "thermometer." "Exo" means "outside" and "endo" means "inside." Thus, an endothermic reaction pulls heat into an object or area, while an exothermic reaction expels heat.