Following are different types of chemical reaction:
Combination reaction When two or more reactants combine to give one product, the reaction is called combination reaction.
A+B → AB
Example: When carbon is burnt in air, it gives carbon dioxide.
C + O2 → CO2
When magnesium ribbon is burnt in air, it gives magnesium oxide.
2Mg + O2 → 2MgO
Displacement reaction
When an atom or group of atoms in one reactant displaces another atom or group of atoms from another reactant, the reaction is called displacement reaction. In this case, a more reactive atom or group of atoms displaces a less reactive atom or group of atoms.
AB + C → AC + B
Example: When zinc granules are kept in copper sulphate solution, the blue colour or copper sulphate fades away. This happens because zinc displaces copper to form zinc sulphate.
Double displacement reaction
When an atom or group of atoms in both reactants displaces each other, the reaction is called double displacement reaction.
AB +CD → AD+ CB
Example: When sodium hydroxide reacts with copper sulphate, then hydroxide and sulphate ions displace each other and copper hydroxide and sodium sulphate are formed.
CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4
Decomposition reaction
When a reactant dissociates to give two or (RBSESolutions.com) more products, the reaction is called decomposition reaction.
AB → A + B
Example: Calcium carbonate is heated to get calcium oxide and carbon dioxide.
