Why are powdered substances more effective adsorbents than their crystalline forms?
Adsorption is a surface phenomenon.The extent of adsorption depends on the surface area. Therefore, adsorption is directly proportional to the surface area.Increase in the surface area of the adsorbent, increases the total amount of gas adsorbed. A finely divided substance like nickel, platinum & porous substances like charcoal, silica gel provides large surface area but crystalline substances has less surface as compared to finely divided substances, as a result powered substances are more effective adsorbents than their crystalline forms.
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:
| Experiment |
A/ mol L - 1 |
B/ mol L - 1 |
Initial rate/mol L - 1 min - 1 |
| I | 0.1 | 0.1 |
2.0 × 10 - 2 |
| II | -- | 0.2 |
4.0 × 10 - 2 |
| III | 0.4 | 0.4 | -- |
| IV | -- | 0.2 |
2.0 × 10 - 2 |
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
Adsorption is a surface phenomenon.The extent of adsorption depends on the surface area. Therefore, adsorption is directly proportional to the surface area.Increase in the surface area of the adsorbent, increases the tot...
Step-by-step explanation:
• Adsorption is a surface phenomenon
• The extent of adsorption depends on the surface area
• Therefore, adsorption is directly proportional to the surface area
• Increase in the surface area of the adsorbent, increases the total amount of gas adsorbed
• A finely divided substance like nickel, platinum & porous substances like charcoal, silica gel provides large surface area but crystalline substances has less surface as compared to finely divided substances, as a result powered substances are more effective adsorbents than their crystalline forms
This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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