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Methods to Form Lyophobic Colloids

Among the fol...

Question

Among the following, the false statements is:

A

latex is a colloidal solution of rubber particles which are positively charged

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B

tyndall effect can be used to distinguish between a colloidal solution and a true solution

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C

it is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane

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D

lyophilic sol can be coagulated by adding an electrolyte

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Solution

The correct option is C latex is a colloidal solution of rubber particles which are positively charged
Latex is a colloidal solution of rubber particles which are negatively charged. Rubber is obtained by coagulation of latex.

Hence, the correct answer is option $A$

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The clouds consists of charged particles of water dispersed in air. Some of them are positively charged, others are negatively charged. When positively charged clouds come closer, they cause lightening and thundering whereas when positive and negative charged colloids come closer, they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus, coagulation the mist hanging in air.

Clouds are colloidol solution of :

The clouds consists of charged particles of water dispersed in air. Some of them are positively charged, others are negatively charged. When positively charged clouds come closer, they cause lightening and thundering whereas when positive and negative charged colloids come closer, they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus, coagulation the mist hanging in air.

AgI helps in artificial rain because :

The clouds consist of charged particles of water dispersed in the air. Some of them are positively charged, others are negatively charged. When positively charged clouds come closer, they cause lightning and thundering whereas when positive and negative charged colloids come closer, they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus, coagulation the mist hanging in the air.

Electrical chimneys are made on the principle of :

Among the following, which effect can be used sometimes to differentiate a true solution from a colloidal solution?

Q. What is meant by coagulation of a colloidal solution? Describe briefly any three methods by which coagulation of lyophobic sols can be carried out.

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Methods to Form Lyophobic Colloids

Standard XII Chemistry

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