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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
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
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Identify the endothermic and exothermic reaction.
\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]
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.
Complete the following statement.
On heating, hydrated copper sulphate changes its colour from ________ to __________.
What do you observe? When
Lead nitrate is heated.
Give an example of an endothermic reaction.
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 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.
