Question

What are the different types of reactions ?
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Answer 1

Answer:

Combustion

Combination

Decomposition

Single replace

Double replacement

Answer 2

Chemical reactions can be classified in the following ways : -

$\Large{\textbf{\textsf{\color{indigo}{Combination\: reaction:-}}}}$

Reactions in which two or more reactants combine to form one product are called combination reactions.

A + B = AB

✍️ Example :-

When magnesium is burnt in the air (oxygen), magnesium oxide is formed. In this reaction, magnesium is combined with oxygen.

Mg [s] + O2 [g] => 2MgO [s]

$\Large{\textbf{\textsf{\color{lime}{Decomposition\: reaction:-}}}}$

Reactions in which one compund decomposes in two or more compounds or elements are known as decomposition reactions.

AB => A + B

✍️ Example :-

When ferric hydroxide is heated, it decomposes into ferric oxide and water.

2Fe(OH)3 [s] => Fe2O3 [s] + 3H2O [l]

$\Large{\textbf{\textsf{\color{indigo}{Displacement\: reaction:-}}}}$

The chemical reactions in which a more reactive element displaces a less reactive element from a compound is known as displacement reaction.

A + BC => AC + B

✍️ Example :-

When zinc reacts with copper sulphate, it forms zinc sulphate and copper metal.

Zn [s] + CuSO4 [aq] => ZnSO4 [aq] + Cu [s]

$\Large{\textbf{\textsf{\color{lime}{Double\: displacement\: reaction:-}}}}$

Reactions in which ions are exchanged between two reactants forming new compounds is called as double displacement reaction.

AB + CD => AC + BD

✍️ Example :-

When sodium hydroxide (base) reacts with hydrochloric acid, sodium chloride and water are formed.

NaOH [aq] + HCl [aq] => NaCl [aq] + H2O [l]

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