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Question
The charges on the colloidal CdS sol and TiO2 sol are respectively:
Options
positive and positive
positive and negative
negative and negative
negative and positive
MCQ
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Solution
Negative and positive
Explanation:
Metal sulfide sols like CdS are negatively charged sols, whereas TiO2 sol belongs to the class of positively charged sols such as metallic hydroxide sols (Fe(OH)3, Al(OH)3, TiO2, etc.) due to preferential adsorption of ions imparting positive charge.
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