Question

give one example each of equation only a)Neutralisation reaction b)precipitation reaction c) simple displacement reaction d)thermal dissociation reaction e) thermal decomposition reaction ​

Answer 1

ANSWER

Displacement reaction :

A single-displacement reaction, also known as a single-replacement reaction, is a reaction by which one

(or more) element(s) replaces an/other element(s) in a compound. It can be represented generally as:

A+B−C→A−C+B

All simple metal with acid reactions are single displacement reactions. For example, the reaction

between magnesium, Mg, and hydrochloric acid, HCl, forms magnesium chloride, MgCl

2

, and hydrogen,

H

2

.

Mg(s)+2HCl(aq)→MgCl

2

(aq)+H

2

(g)

Decomposition reaction :

A decomposition reaction is a type of chemical reaction where one reactant yields two or more

products.

The general form for a decomposition reaction is

AB→A+B

Water can be separated by electrolysis into hydrogen gas and oxygen gas through the decomposition

reaction: 2H

2

O→2H

2

+O

2

Another example is the spontaneous decomposition of hydrogen peroxide into water and oxygen: 2

H

2

O

2

→2H

2

O+O

2

The decomposition of potassium chlorate into potassium chloride and oxygen is yet another example:

2KClO

3

→2KCl+3O

2

Combination reaction :

A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements

or compounds (reactants) combine to form a single compound (product). Such reactions may be

represented by equations of the following form : X+Y→XY.

Formation of calcium oxide by the combination elements calcium and oxygen.

2Ca+O

2

→2CaO

Formation of ammonia by the combination of elements nitrogen and hydrogen.

N

2

+3H

2

→2NH

3

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