What happens when hydrated ferric oxide and arsenious sulphide sols are mixed in almost equal proportions ?
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Which of the following is more effective in coagulating positively charged hydrated ferric oxide sol : (i) KCl, (ii)
[Hint : K3[Fe(CN)6]]
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Extraction of copper directly from sulphide ore is less favourable than from its oxide through reduction. Explain.
2CuS (s) + C (s) => CS2 (l) + 2Cu (s) CuO (s) + C (s) => CO (g) + Cu (s) G value is more ve in second case as compared with first...
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What are lyophilic and lyophobic sols? Give one example of each type.
(i) Lyophilic sols: Colloidal sols that are formed by mixing substances such as gum, gelatin, starch, etc. with a suitable liquid (dispersion medium) are called lyophilic sols. These sols are reversible...
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What are lyophilic and lyophobic sols? Give one example of each type. Which one of these two types of sols is easily coagulated and why?
Lyophilic sols: Lyophilic sols are those sols in which the particles of dispersed phase have great affinity for the dispersion medium, e.g., sols of gum, gelatine, starch, etc. Lyophobic sols:...
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Explain what is observed when: (i) an electrolyte, KCl, is added to a hydrated ferric oxide sol.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by the oppositely charged Cl- ions provided by KCl. (ii) On passing direct current, colloidal particles move towards the oppositely charged...
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What happens in the following activities and why? (i) An electrolyte is added to a hydrated ferric oxide sol in water.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by the negatively charged ions provided by electrolyte. (ii) The path of light becomes visible due to scattering of light by...
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What is meant by coagulation of a colloidal solution? Name any method by which coagulation of lyophobic sols can be carried out.
The colloidal particles bear similar electric charge and that is why they stay away from each other due to repulsion. If the charge is removed, they come together and are...
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Define the following: (i) Peptization (ii) Reversible sols
(i) Peptization: The process of converting a precipitate into colloidal sol by shaking it with dispersion medium in the presence of a suitable electrolyte. (ii) Reversible sols: These are the sols...
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Describe a conspicuous change observed when (i) a solution of NaCl is added to a sol of hydrated ferric oxide.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by negatively charged Cl– ions provided by electrolyte sodium chloride. (ii) The path of light is not visible when light is...
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In which of the following forms is iron absorbed by plants ? (1) Ferric (2) Ferrous (3) Free element (4) Both ferric and ferrous
Iron absorbed by plants is Ferric
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