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  • The Coagulation of colloidal particles of the sol can be caused byOption: 1 Heating Option: 2</str

The Coagulation of colloidal particles of the sol can be caused by

Option: 1

Heating 


Option: 2

Adding oppositively charged sol


Option: 3

Adding Electrolyte 


Option: 4

All of above


Answers (1)

best_answer

By mixing two oppositely charged sols: Oppositely charged sols when mixed in almost equal proportions, neutralise their charges and get partially or completely precipitated. Mixing of hydrated ferric oxide (+ve sol) and arsenious sulphide (–ve sol) bring them in the precipitated forms. This type of coagulation is called mutual coagulation.

By boiling/heating: When a sol is boiled, the adsorbed layer is disturbed due to increased collisions with the molecules of dispersion medium. This reduces the charge on the particles and ultimately leads to settling down in the form of a precipitate.

By addition of electrolytes: When excess of an electrolyte is added, the colloidal particles are precipitated. The reason is that colloids interact with ions carrying charge opposite to that present on themselves. This causes neutralisation leading to their coagulation. The ion responsible for neutralisation of charge on the particles is called the coagulating ion. A negative ion causes the precipitation of positively charged sol and vice versa.

So, all are correct.

Therefore, option number (4) is correct.

Posted by

seema garhwal

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