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प्रश्न
Differentiate between the following:
A catalyst and a promoter.
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 scientific reasons.
While preparing dil. Sulphuric acid from concentrated conc. sulphuric acid in the laboratory the concentrated sulphuric acid is, add slowly to water with constant stirring.
Give an example of the following chemical changes.
A reaction involving blue solution.
Why energy is involved in a chemical change?
Give an example of an endothermic reaction.
Chemical reactions may proceed with absorption of heat. Give an example.
Select the correct answer from the options given below:
State the gaseous product formed, when
Two gases one of them neutral combines by absorption of light energy.
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 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 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.
