Single Choice

The ability of an ion to bring about coagulation of given colloid depends upon

AIts size
BThe magnitude of its charge only
CThe sign of its charge
DBoth the magnitude and the sign of its charge
Correct Answer

Solution

The ability of an ion to bring about coagulation of a given colloid depend upon both the magnitude and sign of its charge. Ions of opposite charge and larger magnitude easily bring about the coagulation even with smaller amount.

SIMILAR QUESTIONS

Surface Chemistry

The dispersed phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively. Which of the following statements is not correct?

Surface Chemistry

Which of the following electrolytes will have maximum coagulating value for $$AgI/Ag^+$$ sol?

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How can a lyophilic sol be coagulated?

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The coagulation of sol particles may be brought about by:

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Equal volume each of two sols of $$AgI$$, one obtained by adding $$AgNO_3 $$ to slight excess of $$KI$$ and another obtained by adding $$KI$$ to slight excess of $$AgNO_3$$ are mixed together . Then :

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Which of the following electrolytes will have maximum coagulating value for $$AgI/Ag^+$$ sol?

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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. AgI helps in artificial rain because :

Surface Chemistry

Alum helps in purifying water by

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