Q. 363.7( 3 Votes )
What are the vari
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 :-
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
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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