A) Explain all the three types of decomposition reactions with relevant equations
Answers
Answer:
Thermal decomposition reaction (Thermolysis)
Decomposition of calcium carbonate:Calcium carbonate (lime stone) decomposes into calcium oxide (quick lime) and carbon dioxide when heated. Quick lime is the major constituent of cement.
Decomposition of potassium chlorate:When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen. This reaction is used for the preparation of oxygen.
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If the decomposition is carried out in the presence of manganese dioxide (MnO2), it takes place at a lower temperature. In this case, MnO2 is used as a catalyst.
Decomposition of ferric hydroxide:Ferric hydroxide undergoes decomposition in the presence of heat, giving ferric oxide and water molecules.
Decomposition of hydrated oxalic acid:
Hydrated oxalic acid (H2C2O4.2H2O) decomposes into oxalic acid and water when heated.
Electrolytic decomposition reaction (Electrolysis)
Electrolytic decomposition may result when electric current is passed through an aqueous solution of a compound. A good example is the electrolysis of water.
Electrolysis of water: Electrolysis of water is the decomposition of water into hydrogen and oxygen due to the passage of electric current through it.
Decomposition of sodium chloride:On passing electricity through molten sodium chloride, it decomposes into sodium and chlorine.
Photo decomposition reaction (Photolysis)
Decomposition of silver chloride:Place a small quantity of silver chloride (AgCl) taken in a watch glass under sunlight for some time. The crystals slowly acquire a grey colour. On analysis, it is found that the sunlight has caused decomposition of silver chloride into silver and chlorine.
Silver bromide also decomposes in the same way.
Decomposition of hydrogen peroxide: In the presence of light, hydrogen peroxide decomposes into water and oxygen
Answer:
the three types of decomposition reactions are
1)thermolysis
2)photolysis
3)electrolysis
Explanation:
thermolysis: the decomposition of a substance by heat.
eg. 2FeSO4--->Fe2O3+SO2+SO3
electrolysis: the decomposition of a substance by passing electricity.
eg.2H2O-->2H2+O2
photolysis: the decomposition of a substance by light.
eg. 2AgCl-->2Ag+Cl2
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