Question

WHAT IS
A) COMBINATION REACTION
B) DECOMPOSITION REACTION
C) DISPLACEMENT REACTION
D)DOUBLE DISPLACEMENT REACTION
E) OXIDATION AND REDUCTION REACTION
SIMPLE DEFINITIONS WITH EXAMPLES PLEASE

Answer 1

Explanation:

A combination reaction is a reaction where two or more elements or compounds combine to form a single compound. Such reactions are represented by equations of the following form: X + Y → XY.The combination of two or more elements to form one compound is called a combination reaction.

Answer 2

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A. COMBINATION REACTION

➠ A reaction in which two or more reactants combine to form a single product is called a

combination reaction.

$\sf \small\: E.g. - : \: \: C + \: O_2 \: ⇢ \: \: CO2$

B. DECOMPOSITION REACTION

➠ A reaction in which a compound splits into two or more simple substances is called a decomposition reaction.

Types of Decomposition Reaction

a) Thermal decomposition : When decomposition is carried out by heating.

$\sf \small \: E.g. - : \: \: CaCO_3 ⇢ \: CaO + CO_2$

b) Electrolytic decomposition : When decomposition is carried out by passing electricity.

$\sf \small \: E.g. - : \: \: 2H_2O ⇢ 2H_2 + O_2$

c) Photolytic decomposition : When decomposition is carried out in presence of sunlight.

$\sf \small \: E.g. - : \: \: 2AgCl ⇢ 2Ag +Cl_2$

➺ While coloured silver chloride turns grey on exposure to sunlight. This reaction is used in

black and white photography.

C. DISPLACEMENT REACTION

➠ The chemical reaction in which a more reactive metal displaces a less reactive metal from its salt solution is called displacement reaction.

$\sf \: \small \: E.g. - : \: Fe + CuSO_4 ⇢ FeSO_4 + Cu$

➺ The blue colour of copper sulphate changes to pale green colour due to the formation of

ferrous sulphate and brown coloured deposition of copper is observed.

D. DOUBLE DISPLACEMENT REACTION

➠ A reaction in which new compounds are formed by mutual exchange of ions between the

reactants is called double displacement reaction.

$\sf \small \: E.g. - : \: Na_2SO_4 + BaCl_2 ⇢ BaSO_4 + 2NaCl$

➺ White precipitate of barium sulphate is formed, so it is also called a precipitation reaction

E. OXIDATION AND REDUCTION REACTION

➠ Oxidation : Addition of oxygen to reactant / Removal of hydrogen from a reactant.

$\sf \small \: C + O_2 ⇢CO_2$

➠ Reduction : Addition of hydrogen to reactant/ Removal of oxygen from reactant.

$\sf \small \: CuO + H_2 ⇢ Cu + H_2O$

In this reaction, substance oxidized is H2 and substance reduced is CuO .

➺ CuO is oxidizing agent and H2 is reducing agent. Since oxidation and reduction are taking place together, it is a redox reaction.

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