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प्रश्न
Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?
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उत्तर
According to the Schulze-Hardy rule, the effectiveness of the salt causing flocculation depends on the charge on the ion of opposite sign to the charge on the sol particles. The greater the magnitude of the opposite charge, the higher the ability of a salt to coagulate the sol.
Thus, trivalent salt AlCl3 is more effective in causing the coagulation of a negatively charged sol than divalent salt MgCl2.
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संबंधित प्रश्न
Define the following term:
Zeta potential
Define the following terms: Associated colloids
Give reasons for the following observations: Leather gets hardened after tanning.
Explain what is observed when a beam of light is passed through a colloidal sol.
Explain the terms Dialysis
What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution?
What happens when an emulsion is centrifuged?
Why do we add alum to purify water?
Match the statement given in Column I with the phenomenon given in Column II.
| Column I | Column II |
| (i) Dispersion medium moves in an electric field | (a) Osmosis |
| (ii) Solvent molecules pass through semi permeable membrane towards solvent side |
(b) Electrophoresis |
| (iii) Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes |
(c) Electroosmosis |
| (iv) Solvent molecules pass through semi permeable membranes towards solution side |
(d) Reverse osmosis |
Assertion: Colloidal solutions show colligative properties.
Reason: Colloidal particles are large in size.
