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प्रश्न
Differentiate between the following:
A catalyst and a promoter.
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उत्तर
- Catalyst: “A substance that alters the rate of a chemical reaction.”
e.g. MnO2, V2O5, Fe, Pt. etc.
The positive catalyst: A catalyst that speeds up the reaction.
Negative catalyst: A catalyst that reduces the rate of reaction, e.g. alcohol.
Enzymes are biological catalysts present in the human body and accelerate the biochemical reactions in the body. - Promotors: Promotors are a catalyst to catalyst, i.e. a substance which increases the activity of a catalyst.
Molybdenum [MO] is added to the catalyst iron [Fe] to increase its efficiency.
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संबंधित प्रश्न
Define endothermic reactions. Give two examples of each.
Give an example of the following chemical changes.
A reaction involving blue solution.
Give an example of the following chemical changes.
An exothermic and an endothermic reaction involving carbon as one of the reactants.
State the following reaction whether heat is evolved or absorbed –
Two neutral gases combine to give a basic gas.
Complete the statement by filling in the blank with the correct word:
The element molybdenum used in the reaction of nitrogen with hydrogen at elevated temperatures is an example of a ________.
Chemical reactions may proceed with evolution of heat. Give an example.
Select the correct answer from the options given below:
State the gaseous product formed, when
An exothermic reaction takes place between ammonia and neutral gas.
Give scientific reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give a scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is slowly added to water with constant stirring.
