In colloidal state particle size ranges from 

Options

A. `1-10Å`
B. `20-50Å`
C. `10-1000Å`
D. `1-280Å`

Answer

To solve the question regarding the particle size range in a colloidal state, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Particle Size Range**:
The question states that in the colloidal state, the particle size ranges from \(10^{-7}\) cm to \(10^{-5}\) cm.

2. **Convert Centimeters to Angstroms**:
We know that \(1 \text{ cm} = 10^8 \text{ Å}\) (Angstroms). Therefore, we need to convert the given sizes in centimeters to Angstroms.

- For the lower limit:
\[ 10^{-7} \text{ cm} = 10^{-7} \times 10^8 \text{ Å} = 10^{1} \text{ Å} = 10 \text{ Å} \]

- For the upper limit:
\[ 10^{-5} \text{ cm} = 10^{-5} \times 10^8 \text{ Å} = 10^{3} \text{ Å} = 1000 \text{ Å} \]

3. **Determine the Range**:
Now we can state that the particle size in the colloidal state ranges from \(10 \text{ Å}\) to \(1000 \text{ Å}\).

4. **Conclusion**:
Therefore, the particle size in the colloidal state ranges from \(10 \text{ Å}\) to \(1000 \text{ Å}\).

### Final Answer:
The particle size in the colloidal state ranges from \(10 \text{ Å}\) to \(1000 \text{ Å}\).

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