On passing H2S gas through dilute HNO3 the colourless soluti

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Surface Chemistry

Short 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?

Answer:

3H₂S + 2HNO₃ -----> 3S + 2NO + 4H₂O
Due to the formation of colloidal sulphur the colourless solution turned to turbid.

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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?

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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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