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 Multiple Choice QuestionsShort Answer Type

191. Define ultrafiltration.
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192. Define peptization.
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193. What is an adsorption isotherm?
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194. On passing H2S gas through dilute HNO3 the colourless solution becomes turbid, why?
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195. What is the function of emulsifying agent?
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196. Why are lyophillic sols self-stabilised?
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197. What is sorption?
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198. What happens when freshly prepared Fe(OH)3 is shaken with a little amount of dilute FeCl3?


Answer:

When freshly precipitated Fe(OH)3 is shaken with little amount of dilute solution of FeCl3(electrolyte).
Peptization process (ions of the electrolyte are adsorbed by the precipitate particles) takes place by converting the Fe(OH)3 precipitate into colloidal solution positively charged solution of Fe(OH)3.


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199. How can dialysis be made fast?
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200. Explain the following term giving a suitable example: Emulsification.
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