Consider the following statements and arrange in the order of true/false as given in the codes .
`S_1`:Colour of a colloidal solution depends upon the size and shape of sol particles.
`S_2`:Bromnian motion is due to continuous bombardment of sol particles by molecules of disperson medium.
`S_3`:When negatively charged smoke comes in contact with positively charged clouds.rain fall takes place.
`S_4`:For a positive sol, flocculation values are in the order. `NaClgtK_2SO_4gtNa_3PO_4gtK_4[Fe(CN)_6]`

Options

A. TTTT
B. TTFF
C. TFTF
D. FFFF

Explanation

To determine the truth values of the given statements, let's analyze each one step by step.

### Step 1: Analyze Statement S1
**Statement S1**: The color of a colloidal solution depends upon the size and shape of sol particles.

- **Analysis**: This statement is true. The color of colloidal solutions can vary based on the size and shape of the particles suspended in the solution. Smaller particles may scatter light differently than larger ones, leading to different observed colors.

### Step 2: Analyze Statement S2
**Statement S2**: Brownian motion is due to continuous bombardment of sol particles by molecules of dispersion medium.

- **Analysis**: This statement is also true. Brownian motion refers to the random movement of colloidal particles resulting from collisions with the molecules of the dispersion medium. This phenomenon is a fundamental characteristic of colloidal systems.

### Step 3: Analyze Statement S3
**Statement S3**: When negatively charged smoke comes in contact with positively charged clouds, rainfall takes place.

- **Analysis**: This statement is true as well. The interaction between negatively charged smoke particles and positively charged cloud particles can lead to coagulation, which may result in the formation of larger droplets that eventually fall as rain.

### Step 4: Analyze Statement S4
**Statement S4**: For a positive sol, flocculation values are in the order: NaCl > K2SO4 > Na3PO4 > K4[Fe(CN)6].

- **Analysis**: This statement is true. Flocculation values are inversely proportional to the charge of the ions. The order given reflects the increasing charge of the ions involved, which correlates with decreasing flocculation values. Therefore, this order is correct.

### Conclusion
All statements (S1, S2, S3, and S4) are true.

### Final Answer
The order of true/false for the statements is:
- S1: True
- S2: True
- S3: True
- S4: True

Thus, the final answer is: **True, True, True, True**.

---