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Question
In which of the sols, the colloidal particles are with negative charge?
In which of the sols, the colloidal particles are with negative charge?
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Solution
The correct option is C Starch
Depending upon the nature of charge on the particles of the dispersed phase, the colloidal solutions are classified into positively charged and negatively charged colloids.
The sol particles acquire positive or negative charge by preferential adsorption of positive or negative ions. When two or more ions are present in the dispersion medium, usually preferential adsorption of the ion common to the colloidal particle takes place.
Positively charged sols are mostly metal hydroxides whereas negatively charged sols are metal sols or metal sulphide sols. Gold sol and starch sol are examples which are negatively charged.
Hydrated Al2O3, TiO2 and Haemoglobin are positive charged sol.
Hence, option (d) is correct.
Depending upon the nature of charge on the particles of the dispersed phase, the colloidal solutions are classified into positively charged and negatively charged colloids.
The sol particles acquire positive or negative charge by preferential adsorption of positive or negative ions. When two or more ions are present in the dispersion medium, usually preferential adsorption of the ion common to the colloidal particle takes place.
Positively charged sols are mostly metal hydroxides whereas negatively charged sols are metal sols or metal sulphide sols. Gold sol and starch sol are examples which are negatively charged.
Hydrated Al2O3, TiO2 and Haemoglobin are positive charged sol.
Hence, option (d) is correct.
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