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प्रश्न
What is the role of a catalyst in a chemical reaction?
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उत्तर
Substances used to alter the speed of a chemical reaction, are called catalysts. For example, metallic iron is used as a catalyst in the manufacture of ammonia by Haber’s process.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
What are chemical reactions?
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Give a chemical test to distinguish between the following gases.
H2 and CO2
Give a chemical test to distinguish between the following gases.
H2 and O2
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Limestone contains ______ mainly.
The percentage composition of Nitrogen in Ureas is ______.
When magnesium is burnt in the air, a new substance is formed which is ______.
