Surface Chemistry Three Marks Questions

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 27
    9 x 3 = 27
  1. Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.

  2. What happens when a colloidal sol of Fe(OH)3 and AS2O3 are mixed?

  3. What is the difference between a sol and a gel?

  4. Why are lyophillic colloidal sols are more stable than lyophobilc colloidal sol.

  5. Addition of Alum purifies water. Why?

  6. What are the factors which influence the adsorption of a gas on a solid?

  7. What are enzymes? Write a brief note on the mechanism of enzyme catalysis.

  8. What do you mean by activity and selectivity of catalyst?

  9. Describe some feature of catalysis by Zeolites.

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