Which of the following will show Tyndall effect?
a.Aqueous solution of soap below critical micelle concentration
b.Aqueous solution of soap above critical micelle concentration
c.Aqueous solution of sodium chloride
d.Aqueous solution of sugar

Options

A. Aqueous solution fo soap below critical micelle concentration
B. Aqueous solution of soap above critical micelle concentration
C. Aqueous solution of sodium chloride
D. Aqueous solution of sugar

Explanation

To determine which of the given options will show the Tyndall effect, we need to understand the concept of the Tyndall effect and the nature of the solutions mentioned in the options.

### Step-by-Step Solution:

1. **Understanding the Tyndall Effect**:
- The Tyndall effect is the scattering of light by particles in a colloid or very fine suspension. It makes the path of light visible when it passes through the medium.
- This effect is typically observed in colloidal solutions, where the size of the dispersed particles is large enough to scatter light.

2. **Identifying the Types of Solutions**:
- **Aqueous solution of soap below critical micelle concentration (CMC)**: Below CMC, soap molecules exist as individual molecules and do not form micelles. This solution does not exhibit the Tyndall effect because it is not a colloidal solution.
- **Aqueous solution of soap above critical micelle concentration (CMC)**: Above CMC, soap molecules aggregate to form micelles, creating a colloidal solution. This solution will exhibit the Tyndall effect due to the scattering of light by the micelles.
- **Aqueous solution of sodium chloride**: Sodium chloride (NaCl) dissolves completely in water to form a true solution. True solutions have particles that are too small to scatter light, so they do not show the Tyndall effect.
- **Aqueous solution of sugar**: Similar to sodium chloride, sugar dissolves completely in water to form a true solution. Therefore, it also does not exhibit the Tyndall effect.

3. **Conclusion**:
- From the analysis:
- Option A (below CMC) does not show Tyndall effect.
- Option B (above CMC) does show Tyndall effect.
- Option C (sodium chloride) does not show Tyndall effect.
- Option D (sugar) does not show Tyndall effect.
- Therefore, the correct answer is **option B**: Aqueous solution of soap above critical micelle concentration.