Question

(a) What is the difference between displacement and double displacement reactions ? Write equations for
these reactions.
(b) What do you mean by a precipitation reaction ? Explain giving an example.

Lakhmir Singh Chemistry Class 10

Answer 1

(A)@displacement reaction
the reaction in which one element displaced the elements of a compound is said to be double displacement reaction

- NaOH +K2=KOH + H2

@double displacement reaction
the reaction in which double displacement of elements take place is said to be double displacement.

- NaOH + HCL =NaCl+H2O


(B) Precipitation Reaction
precipitation reactions are those in which after reactions a precipitate(powder ) form..

☆as in case of CaCO3

on reacting with air (heat) a white precipitate is formed..which is called lime powder.

hope it will help you dear ☺

Answer 2

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

For Example: CuSo4 (aq) + Zn (s) → ZnSO4 (aq) + Cu (s)

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

For Example: Na2SO4 (aq) + BaCl2 (aq) → BaSO4 (s) + 2NaCl (aq)