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Question

A lyophilic sol is at its isoelectric point then it is:

A
negatively charged
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B
positively charged
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C
not charged
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D
none of these
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Solution

The correct option is D not charged
In a lyophilic sol, the hydrogen ion concentration at which the colloidal particles are neither positively charged nor negatively charged (i.e. uncharged) is known as the isoelectric point of the colloid. At this point, the lyophilic colloid is expected to have minimum stability because at this point particles have no charge.

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