Surface Chemistry Quiz - CBSE Class 11 Science
Free practice quiz: Surface Chemistry (CBSE Class 11 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is NOT a type of adsorption?
- Physical adsorption
- Chemical adsorption
- Desorption
- Absorption
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Answer: D. Absorption
Absorption involves the substance being absorbed into the bulk of the material, while adsorption involves the substance sticking to the surface.
What is the term for the substance adsorbed onto a surface?
- Adsorbent
- Adsorbate
- Absorbent
- Absorbate
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Answer: B. Adsorbate
The substance being adsorbed is called the adsorbate.
What is the Freundlich adsorption isotherm?
- A linear relationship between adsorption and pressure
- An exponential relationship between adsorption and pressure
- A logarithmic relationship between adsorption and pressure
- No relationship between adsorption and pressure
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Answer: C. A logarithmic relationship between adsorption and pressure
The Freundlich isotherm describes the adsorption behavior using a logarithmic relationship.
What is a catalyst?
- A substance that increases the rate of a reaction without being consumed
- A substance that decreases the rate of a reaction without being consumed
- A substance that is consumed during a reaction
- A substance that has no effect on the rate of a reaction
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Answer: A. A substance that increases the rate of a reaction without being consumed
A catalyst speeds up a reaction without being used up.
Explain the role of promoters in catalysis.
- Decrease the activity of the catalyst
- Increase the activity of the catalyst
- Have no effect on the catalyst
- Poison the catalyst
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Answer: B. Increase the activity of the catalyst
Promoters enhance the catalytic activity.