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Surface Chemistry
Short Answer Type
21.
What are homogeneous and heterogeneous catalysts?
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22.
What are Zeolites?
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23.
Write the Freundlich adsorption isotherm for the adsorption from solution.
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24.
Give the Langmuir adsorption isotherm expression for the adsorption from solutions.
Answer:
The expression for the adsorption from solution given by Langmuir is
x
m
=
aC
1
+
bC
,
where a and b
are Langmuir constants. c = concentration.
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25.
Why catalyst are required in very small non-stoichiometric quantities?
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26.
What are enzymes?
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27.
Name some solid catalysts.
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28.
What is meant by the term ‘peptization’?
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29.
How does BF
3
act as a catalyst in industrial process?
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30.
What happens when an electric field is applied to a colloidal dispersion?
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