Page 1 - 3. LESSON NOTES- (DISPLACEMENT&DOUBLE DISPLACEMENT REACTION)

SAI International School
Class-X

Subject_ Chemistry
Topic-Chemical Reactions and Equations
Sub topic-Types of Chemical Reactions

(Displacement & Double displacement Reactions)
LESSON NOTES

To be done in CW Copy
Single Displacement
Reaction
Displacement Reactions may be of two types-
Double Displacement
Reaction

A. Single Displacement Reaction-
A single-displacement reaction, is a chemical reaction in which one (or more)
element(s) replaces another element(s) in a compound. It can be represented
generically as:

A + B-C → A-C + B

This will most often occur if A is more reactive than B, thus giving a more stable
product. A and B must be either:
a) Different metals (hydrogen's behaviour as a cation renders it as a metal here),
in which case C represents an anion;

{The reactivity of Metals can be known from the Reactivity Series,
where Metals are arranged in the decreasing order of their reactivities.
(Hydrogen's behavior as a cation renders it as a metal here). -

K, Na, Ca, Mg, Al, Zn, Fe, Ni, Sn, Pb, [H], Cu, Hg, Ag, Au, and Pt.}

b) Halogens, in which case C represents a cation.
Both metals and non-metals take part in displacement reactions.
➢ When Element C is a metal :
Example :
1. Reaction of iron nails with copper sulphate solution-

Fe + Cu(SO4)2 -> Fe(SO4)2 + Cu(s) [Fe>Cu]

1