At a given temperature, osmotic pressure of a concentrated solution of a substance __

Options

A. is higher than that at a dilute solution
B. is lower than that of a dilute solution
C. is same as that of a dilute solution
D. cannot be compared with osmotic pressure of dilute solution

Answer

To solve the question regarding the osmotic pressure of a concentrated solution of a substance, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Osmotic Pressure**:
- Osmotic pressure (π) is defined as the pressure required to stop the flow of solvent into a solution through a semipermeable membrane. It is a colligative property, which means it depends on the number of solute particles in a solution.

2. **Use the Formula for Osmotic Pressure**:
- The formula for osmotic pressure is given by:
\[ \pi = C \cdot R \cdot T \]
where:
- \( \pi \) = osmotic pressure
- \( C \) = molarity (concentration) of the solution
- \( R \) = ideal gas constant
- \( T \) = absolute temperature (in Kelvin)

3. **Analyze the Relationship Between Concentration and Osmotic Pressure**:
- From the formula, we can see that osmotic pressure (π) is directly proportional to the concentration (C) of the solution. This means that as the concentration of the solution increases, the osmotic pressure also increases.

4. **Compare Concentrated and Dilute Solutions**:
- A concentrated solution has a higher concentration (C) compared to a dilute solution. Therefore, the osmotic pressure of a concentrated solution will be higher than that of a dilute solution.

5. **Conclusion**:
- Based on the analysis, we conclude that the osmotic pressure of a concentrated solution of a substance is higher than that of a dilute solution.

### Final Answer:
The osmotic pressure of a concentrated solution of a substance is **higher than that at a dilute solution**.

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