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प्रश्न
What do you understand by 'chemical reaction'?
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उत्तर
A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).
A chemical change or chemical reaction occurs when particles collide. Collisions occur when reactants are in close contact or by supply of energy.
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संबंधित प्रश्न
How is precipitate formation in a chemical reaction indicated?
Explain the following reaction with one suitable example of Combination reactions .
Define the following term:
Precipitate
Give an example of a reaction where the following are involved:
Close contact
Give an example of the following chemical change.
A reaction where colour change is noticed
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Iron and rust are the same substances.
