Question

combination reaction , dispacement ,decomposition , double displacemant​

Answer 1

Answer:

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

for eg:Mg(s) + O2(g) → 2MgO(s)

Magnesium + Oxygen → Magnesium Oxide

Decomposition Reaction: Reactions in which one compound decomposes in two or more compounds or elements are known as Decomposition Reaction. A decomposition reaction is just the opposite of combination reaction.

for eg : When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide.

CaCO3(s) heat−→− CaO(s) + CO2(g)

Calcium carbonate → Calcium oxide + Carbon dioxide

Thermal Decomposition: The decomposition of a substance on heating is known as Thermal Decomposition.

Example: 2Pb(NO3)2(s) heat−→− 2PbO(s) + 4NO2(g) + O2(g)

Electrolytic Decomposition: Reactions in which compounds decompose into simpler compounds because of passing of electricity, are known as Electrolytic Decomposition. This is also known as Electrolysis.

Example: When electricity is passed in water, it decomposes into hydrogen and oxygen.

2H2O(l)→2H2(g)+ O2(g)

Photo Decomposition Reaction: Reactions in which a compound decomposes because of sunlight are known as Photolysis or Photo Decomposition Reaction.

Example: When silver chloride is put in sunlight, it decomposes into silver metal and chlorine gas.

2AgCl(s) (white) Sunlight−→−−−−− 2Ag(s) (grey) + Cl2(g)

Displacement Reaction: The chemical reactions in which a more reactive element displaces a less reactive element from a compound is known as Displacement Reactions. Displacement reactions are also known as Substitution Reaction or Single Displacement/ replacement reactions.

Examples:

When zinc reacts with hydrochloric acid, it gives hydrogen gas and zinc chloride.

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Double Displacement Reaction: Reactions in which ions are exchanged between two reactants forming new compounds are called Double Displacement Reactions.

AB + CD → AC + BD

Examples:

When the solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) (Precipitate) + 2NaCl(aq)

Explanation:

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