Answer :

The various types of chemical reactions are:


i. Addition reactions:


The reaction in which two or more reactants combine to form a single product are known as addition reaction. In this new type of bonds are formed between the reactants.


Ex- C(s) + O2(g) CO2(g)


ii. Replacement reactions:


In these reactions a more reactive element replaces a less reactive element from its compound.


Ex- Fe + CuSO4 FeSO4 FeSO4 + Cu


Double displacement reaction:


This is a subcategory of replacement reactions in which mutual exchange of ions occurs between two reactants.


Ex – CuSO4 + 2NaOH Cu(OH)2 + Na2SO4


iii. Dissociation reactions:


These are the reactions in which a single reactant decompose to form two or more products. There are various types of dissociation reaction as follows: -


The types of dissociation reaction are :-


a) Electrolysis:


In this method electrical energy is used to decompose the reactant into products. Electric energy is passes through the fused salt of the substance.


Example – Electrolysis of water gives hydrogen and oxygen as shown –


2H2O 2H2 + O2


b) Thermal decomposition:


In this method heat energy is used to decompose the reactant into products.


Example – Decomposition of calcium carbonate as shown to give calcium oxide and oxygen–


CaCO3 CaO + O2


c) Photolysis:


In this method energy from the sun is used to decompose the reactant into products.


Example – Decomposition of hydrogen bromide s shown –


2HBr H2 + Br2


iv. Reversible reactions:


The reactions those which occur in both forward and backward direction are known as reversible reactions.


Ex- N2 + 3H2 2NH3


v. Irreversible reactions:


Those reactions which flow in only one direction and products are formed from the reactants are known as irreversible reactions.


Ex- C + O2 CO2


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