Chemistry Part-I
Class 12
NCERT
1
Chapter 1: The Solid State
31 questions
2
Chapter 2: Solutions
54 questions
3
Chapter 3: Electrochemistry
28 questions
4
Chapter 4: Chemical Kinetics
40 questions
5
Chapter 5: Surface Chemistry
27 questions
Q1
What is the difference between physisorption and chemisorption?
Q2
What do you mean by activity and selectivity of catalysts?
Q3
Give reason why a finely divided substance is more effective as an adsorbent.
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Chapter 6: General Principles and Processes of Isolation of Elements
30 questions
7
Chapter 7: The p-Block Elements
62 questions
8
Chapter 8: The d-and f-Block Elements
48 questions
9
Chapter 9: Coordination Compounds
38 questions
Question
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Solving time: 2 mins
What do you mean by activity and selectivity of catalysts?
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Activity is the ability of the catalyst to increase the rate of reaction. For example, in absence of a catalyst, the reaction between hydrogen and oxygen to form water does not occur at an appreciable rate. Infact, hydrogen and oxygen can be safely stored together without reaction. In the presence of platinum catalyst, the reaction occurs with explosive violence. In few reactions, the catalyst can accelerate the rate of reaction to as high as times.
The ability of the catalyst to direct the reaction to give particular products is its selectivity. For example, n-heptane in presence of platinum catalyst gives toluene.
Also, propylene reacts with oxygen in the presence of bismuth molybdate catalyst to selectively give acrolein, .
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| Question Text | What do you mean by activity and selectivity of catalysts? |
| Updated On | Apr 26, 2022 |
| Topic | Surface Chemistry |
| Subject | Chemistry |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 238 |
| Avg. Video Duration | 5 min |
