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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
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Heat energy is evolved in these reactions
- Thermal decomposition reactions
- Exothermic reactions
- Endothermic reactions
- None of these
Name a nitrate which produces oxygen as the only gas.
State which type of chemical reaction proceeds with evolution of heat energy.
State the following reaction whether heat is evolved or absorbed –
Two neutral gases combine to give a basic gas.
Chemical reactions may proceed with evolution of heat. Give an example.
Give an example with a balanced equation, of the following reaction:
photochemical reaction
Differentiate between the following:
Electrolytic decomposition and photochemical decomposition.
Write an Explanation.
Endothermic reaction
True or False. If false, give the correct answer.
Tarnishing of silver is an example of endothermic change.
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.
