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What will happen when a small amount of ...

What will happen when a small amount of NaCl solution is added to hydrated ferric oxide sol ?

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hydrated ferric oxide is ferric hydoxide sol and is positively charged.When aqueous solution of NaCl is added to it,the `Cl^(-)` ions neutralise the positive charge on the sol particles. In the absence of charge, brown precipitate is formes due to colloids can be coagulation of particles.
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DINESH PUBLICATION-SURFACE CHEMISTRY -QUESTION FROM BOARD EXAMINATIONS
  1. Why is pyophobis sol easily congulated as compared to lyophilic sol ?

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  2. Mention two ways by which lyophobic colloids can be coagulated.

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  3. What will happen when a small amount of NaCl solution is added to hydr...

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  4. Why does physisorption decrease with increase in temperature ?

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  5. A synthetic rubber which is resistant to the action of oils gasoline a...

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  6. What is Tyndall Effect?

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  7. What is coagulation process ?

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  8. What is an emulsion ?

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  9. Name two types of adsorption phenmenon.

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  10. Name the catalyst and promoter in the Haber's process for the manufact...

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  11. What are the physical states of the dispersion medium and dispersed ph...

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  12. Adsorption of a gas on the surface of solid is sgenerally accompanied ...

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  13. How does increase in tempeature affect both physical and chemical adso...

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  14. What do you understand by shape selective catalysis? Why are zeolites ...

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  15. Name a process by which coagulation of lyophobic sol can be carried ou...

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  16. What is a reversible sol. ?

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  17. How are the folowihg colloids different with respwct ot dispersed phas...

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  18. Give one example of aerosol and gel.

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  19. Classify colloids where dispersion medium is water. State their charac...

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  20. Explain what is observed when : (i) a beam of light is passed throug...

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