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प्रश्न
A colloid is formed by adding \[\ce{FeCl3}\] in excess of hot water. What will happen if excess sodium chloride is added to this colloid?
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उत्तर
\[\ce{FeCl3}\] when added into hot water, it forms hydrated ferric oxide, which is a positively charged sol due to absorption of \[\ce{Fe^{3+}}\] ions. On adding \[\ce{NaCl}\] the negatively charged chloride ions neutralize the positive charge of the solution and coagulation of the sol takes place.
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संबंधित प्रश्न
Define the following with a suitable example, of each:
Gel
Distinguish between lyophobic and lyophilic sols.
Explain the term emulsion and types of emulsions.
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i. The colour of colloidal dispersion depends on size of colloidal particles.
ii. Tyndall effect is used to distinguish between colloidal dispersion and true solution.
iii. Eosin and congo red are examples of negatively charged sols.
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i. \[\ce{PO^{3-}_4}\]
ii. \[\ce{SO^{2-}_4}\]
iii. \[\ce{[Fe(CN)6]^{4-}}\]
iv. \[\ce{NO^-_3}\]
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