Question

short of defination of 1)displacement reaction 2)double displacement reaction

Answer 1

Displacement reaction are reactions where one reactant replaces part of the other.
AB+C = AC +B.

Double displacement reaction are reactions where the cotions and anions in the reactants switch partners to form others.
AB+CD=AD+CB.

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Answer 2

1. Single displacement reaction

A reaction in which a more reactive metal displaced a less reactive metal from its salt solution.

2.double displacement reaction=

neutralization and precipitation reaction .

When acid reacts with a base to form metal salt and water is neutralization reaction.

Two transparent solutions on mixing results in formation of precipitate.