Surface-Chemistry-Quiz-8

Surface Chemistry Quiz-8

Dear Readers,

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Q1. Cod liver oil is :

•  Fat dispersed in water
•  Water dispersed in fat
•  Water dispersed in oil
•  Fat dispersed in fat

Solution
It is w/o type emulsion.

Q2.Whenever, gels are placed with their dispersed phase, they :

•  Swells up
•  Show intake of the dispersed phase
•  Develops imbibition
•  All of the above

Solution
This is the phenomenon of gel, called as imbibition or swelling up of gels.

Q3.  Which of the following is mismatched? Dispersed Phase Dispersed medium Specific name

•   Liquid liquid emulsion
•  Solid solid solid sol
•  Liquid gas aerosol
•  Gas solid foam

Solution
When dispersed phase is gas and dispersion medium is solid the colloidal sol obtained is termed as solid foam

Q4. Amongst the following chemical reaction, the one representing homogeneous catalysis is

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Solution

Q5.The coagulation of 10 ccm of gold sol is completely prevented by addition of 0.025 g of starch to it.

The gold number of starch is

•  0.025
•  0.25
•  2.25
•  25

Solution
Gold number is the amount of substance in milligram that is required to prevent coagulation of 10 ccm of gold sol by addition of 1 mL of 10% NaCl solution.

Convert 0.025 g into milligram = 25 

0.025 g starch=0.025×1000=25 mg 

Thus, the gold number of starch = 25

Q6. Point out the false statement

•  The size range of colloidal particles is 10−2000Å
•  Colloidal solutions are homogeneous systems
• Colloids carry charge
•  Colloids show Tyndall effect

Solution
Colloidal solutions are heterogenous in nature

Q7.Which is an example of negative catalysis?

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Solution

Q8.Butter is a colloid form in which :

•  Fat is dispersed in solid casein
•  Fat globules are dispersed in water
•  Water is dispersed in fat
•  Suspension of casein is in water

Solution
Butter is an w/o emulsion having fat dispersed in water.

Q9.According to Freundlich adsorption isotherm, which of the following is correct?

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•  All of the above are correct for different ranges of pressure

Solution
All of the above are correct for different ranges of pressure

Q10. The minimum flocculation power offor a positively charged sol are in the order of

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Solution