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Q.

Which of the following is a negatively charged sol

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a

Haemoglobin 

b

Methylene blue sol 

c

Metal sulphide sol 

d

Hydrated metaloxide

answer is C.

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Detailed Solution

The sol particles acquire positive and negative charges by absorption of positive and negative ions. When the two ions are present in the dispersion medium, the adsorption of the ion to the colloidal takes place. Metal hydroxides are mostly positively charged. Metal sulfides are generally negatively charged sol. Methylene blue sol is a negatively charged sol.

Therefore, option C is correct.

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