Decomposition Reaction
Decomposition Reaction
Decomposition Reaction:
A reaction in which a single reactant breaks down to form two or more products,is known as decomposition reaction. This reaction is opposite to combination reaction. On the basis off the form of energy required for the reaction, these reactions are of three types:
(i) Thermal decomposition
These reactions use the energy in the form of heat for decomposition of the reactant, e.g.
(a) Calcium carbonate on heating, decomposes to give calcium oxide and carbon dioxide. Calcium oxide is used for manufacturing of cement.
Calcium carbonate Calcium oxide + Carbon dioxide
(Limestone) (Quick lime)
Which of the following are correct ? (a) Photo chemical reaction involves the use of light energy for the purpose of decomposition . (b) When silver chloride is exposed to light, it decomposes to give silver metal and chloride gas. (c) Digestion of food in our body is also a decomposition reaction. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct ? (a) Electrolysis reaction involves the use of electrical energy for the decomposition of the reactant molecules . (b) When electric current is passed through water, it decomposes to give oxygen and hydrogen. (c) When electric current is passed through molten sodium chloride, it decomposes to give sodium metal and chlorine gas . | |||
| Right Option : D | |||
| View Explanation | |||
_________________ are used to extract several metals from their oxides or salts. | |||
| Right Option : C | |||
| View Explanation | |||
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