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Surface Chemistry
Short Answer Type
51.
What happens when a freshly precipitated Fe(OH)
3
is shaken with little amount of dilute solution of FeCl
3
?
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52.
Which will adsorbe more a lump of charcoal or charcoal powder, and why?
Answer:
Adsorption is more in Charcoal powder because it has greater surface area, therefore greater Van der Waal's attraction.
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53.
Draw a plot of variation in the quantity of the gas absorbed (x/m) with the pressure of the gas?
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54.
What is observed when sodium chloride is added to ferric hydroxide sol?
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55.
Give one difference between sol and gel.
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56.
What are macro-molecular colloids? Give one example.
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57.
Derive the variation of x/m versus temperature for physical adsorption process. Explain the nature of the curve.
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58.
What is common in aqua-sols and solid aerosols? Also find the point of distinction between them.
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59.
What is electrophoresis due to?
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60.
Give one example each of positively charged sol and one example of negatively charged sol:
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