Of the following terms used for denoting concentration of a solution, the one which does not get affected by temperature is

Options

A. Molarity
B. Molality
C. Normality
D. Formality

Answer

To determine which term used for denoting the concentration of a solution is not affected by temperature, we can analyze the definitions of the given terms: molarity, molality, normality, and formality.

### Step-by-Step Solution:

1. **Understanding Molarity (M)**:
- Molarity is defined as the number of moles of solute per liter of solution.
- It is temperature-dependent because the volume of the solution can change with temperature.

**Hint**: Remember that volume changes with temperature, affecting molarity.

2. **Understanding Molality (m)**:
- Molality is defined as the number of moles of solute per kilogram of solvent.
- It is not affected by temperature because the mass of the solvent remains constant regardless of temperature changes.

**Hint**: Focus on the mass of the solvent, which does not change with temperature.

3. **Understanding Normality (N)**:
- Normality is defined as the number of equivalents of solute per liter of solution.
- Like molarity, normality is also temperature-dependent due to changes in volume.

**Hint**: Equivalent concentration also relies on volume, which can change with temperature.

4. **Understanding Formality (F)**:
- Formality is defined as the number of moles of solute per liter of solution, similar to molarity.
- Therefore, it is also temperature-dependent.

**Hint**: Similar to molarity, formality is affected by volume changes.

5. **Conclusion**:
- Among the four terms, molality is the only one that does not change with temperature.
- Thus, the answer to the question is **molality**.

### Final Answer:
The term that does not get affected by temperature is **molality** (Option B).