The size of colloidal particles ranges from

Options

A. `1-10 A^(@)`
B. `20 - 50 A^(@)`
C. `10 - 1000 A^(@)`
D. `1 -200 A^(@)`

Answer

To determine the size range of colloidal particles, we can follow these steps:

### Step 1: Understand the Size Range of Colloidal Particles
Colloidal particles typically range in size from 1 nanometer (nm) to 1000 nanometers (nm).

### Step 2: Convert Nanometers to Meters
1 nanometer is equal to \(10^{-9}\) meters. Therefore, the size range in meters is:
- Lower limit: \(1 \, \text{nm} = 1 \times 10^{-9} \, \text{m}\)
- Upper limit: \(1000 \, \text{nm} = 1000 \times 10^{-9} \, \text{m} = 1 \times 10^{-6} \, \text{m}\)

### Step 3: Convert Meters to Angstroms
1 meter is equal to \(10^{10}\) angstroms (Å). Thus, we can convert the size range to angstroms:
- Lower limit: \(1 \, \text{nm} = 10 \, \text{Å}\)
- Upper limit: \(1000 \, \text{nm} = 10000 \, \text{Å}\)

### Step 4: Identify the Correct Option
From the options provided:
1. 1-10 ms
2. 20-50 ms
3. 10-1000 ms
4. 1-200 ms

The correct option that corresponds to the size range of colloidal particles (1 nm to 1000 nm or 10 Å to 10000 Å) is option 3, which is 10-1000 ms.

### Final Answer
The size of colloidal particles ranges from **10 to 1000 ms**.

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