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Surface Chemistry

Short Answer Type

81. What is colloidion?

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82. Which of the following is adsorbed preferably: O₂, NH_3, CO?

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83. Why is a substance more effective in colloidal state?

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84. Why is catalyst, in general, taken in the form of finely divided powder?

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85. Suggest a physical method for the preparation of phosphorus sol.

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86. What name is given to sol in which benzene is dispersion medium?

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87. What is occulusion?

Answer:
Adsorption of gases on the surface of metals is called occlusion.

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88. Give an example of a shape-selective catalyst.

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89. How can dialysis be made fast?

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90. Give an example of peptizing agent?

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