Question

What is the difference between displacement and double displacement reactions? Write equations for these reactions.
NCERT Class 10th Science Chapter 1 Chemical Reactions and Equations

Answer 1

Displacement reaction : The reaction in which an element displaces another element from a substance is called “displacement reaction.” It is represented as

In displacement reaction one element displaces another element from its compound and takes its place therein.Here in above equation hydrogen has displaced from acids by metals.Double displacement : The reaction in which the constituent atoms of the reaction interchange by the decomposition of the two reactants, to produce new compounds are called double displacement reactions.
They are generally represented as follows.

Answer 2

➽━━━━━━━━━━━━━──➸

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✒DEFINITION OF DISPLACEMENT REACTION::--

In a displacement reaction, a more reactive element replaces a less reactive element from a compound.

i.e. A + BX. -----> AX + B

where A is more reactive than B

Example :-

CuSO4 + Zn --> ZnSO4 + Cu

✒DEFINITION OF DISPLACEMENT REACTION::--

In a double displacement reaction, two atoms or a group of atoms change places to form new compounds.

i.e. AB + CD ---> AC + BD

Example:--

Na2SO4 + BaCl ---> NaSO4 + 2NaCl

➽━━━━━━━━━━━━━──➸

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