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Surface Chemist...

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  • Question 1
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    Peptization is a process of :

  • Question 2
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    Tanning of leather is the :

  • Question 3
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    Gelatin is often used as an ingredient in the manufacture of ice-cream. The reason for this is :

  • Question 4
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    The rate of decomposition of aldehyde $$(CH_3CHO)$$ into $$CH_4$$ and $$CO$$ in presence of $$I_2$$ at 800 K follows the rate law: $$r=K[CH_3CHO][I_2]$$. The decomposition is believed to go to the two step mechanism:

    $$CH_3CHO+I_2\rightarrow CH_3I+HI+CO$$

    $$CH_3I+HI\rightarrow CH_4+I_2$$

    What is the catalyst for the reaction? Which of the two steps is the slower one?

  • Question 5
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    Rate of reaction (r) is plotted against temperature (T) for an enzyme catalysed reaction. Which of the following is correct representation?

  • Question 6
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    Milk is an example of :

  • Question 7
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    Substances, which are added to soaps change their properties in order to make them more useful for a particular application, are called ___.

  • Question 8
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    Directions For Questions

    Emulsions are also called the colloidal solutions in which the dispersed phase as well as dispersion medium are liquids. It may be oil-in-water or water-in-oil type. Emulsifiers can be used to stabilize the emulsion. Soaps, detergents, proteins and gums are used as emulsifiers.

    ...view full instructions

    Butter is an emulsion of type :

  • Question 9
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    Directions For Questions

    Substances which alter the velocity of a reaction by mere presence without undergoing any change in mass and composition are termed catalysts and the phenomenon is known as catalysis.

    ...view full instructions

    Which is incorrect for a catalyst?

  • Question 10
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    A freshly obtained precipitate of $$SnO_2$$ is peptized by little of $$KOH$$ to give a sol. The sol particles may be represented as :

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