Haemoglobin and gold sol are examples of

Options

A. positively and negatively charged sols, respectively
B. negatively and positively charged sols, respectively
C. positively charged sols
D. negatively charged sols

Explanation

To solve the question, "Haemoglobin and gold sol are examples of," we need to analyze the nature of these substances in terms of their charge and classification.

### Step-by-Step Solution:

1. **Understanding Colloids**:
- Both haemoglobin and gold sol are classified as colloids. A colloid is a mixture where very small particles of one substance are dispersed in another substance.

2. **Charge of Haemoglobin**:
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