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Haemoglobin and gold sol are examples of:

1. positively charged sols
2. negatively charged sols
3. Positively and negatively charged sols, respectively
4. negatively and positively charged sols, respectively

Correct answer: Positively and negatively charged sols, respectively

Solution

Haemoglobin forms a positively charged sol, while gold sol is negatively charged. Therefore they are positively and negatively charged sols, respectively.

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