One among the following is an incorrect statement -

Options

A. Molality of a solution is dependent on the temperature
B. Molarity of a solution is dependent on the temperature
C. Normality of 0.5 M aqueous solution of `H_(2)C_(2)O_(4). 2H_(2)O` is 1 N
D. Molality of a solution relates moles of solute and mass of solvent

Answer

To determine which statement is incorrect, we will analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement:** "Molality of a solution is dependent on the temperature."

**Analysis:**
- Molality (m) is defined as the number of moles of solute per kilogram of solvent.
- The formula for molality is:
\[ \text{Molality (m)} = \frac{\text{Number of moles of solute}}{\text{Mass of solvent (kg)}} \]
- Since this definition involves mass (which does not change with temperature) and does not involve volume, molality is independent of temperature.

**Conclusion:** This statement is **incorrect**.

### Step 2: Analyze the second statement
**Statement:** "Molarity of a solution is dependent on the temperature."

**Analysis:**
- Molarity (M) is defined as the number of moles of solute per liter of solution.
- The formula for molarity is:
\[ \text{Molarity (M)} = \frac{\text{Number of moles of solute}}{\text{Volume of solution (L)}} \]
- Since the volume of a solution can change with temperature (due to thermal expansion), molarity is indeed dependent on temperature.

**Conclusion:** This statement is **correct**.

### Step 3: Analyze the third statement
**Statement:** "Normality of 0.5 molar aqueous solution of H2C2O4 is 1 normal."

**Analysis:**
- The n-factor for H2C2O4 (oxalic acid) is 2 because it can donate 2 protons (H+ ions).
- Normality (N) is related to molarity (M) by the formula:
\[ \text{Normality (N)} = \text{Molarity (M)} \times \text{n-factor} \]
- Given that the molarity is 0.5 M and the n-factor is 2:
\[ \text{Normality} = 0.5 \, \text{M} \times 2 = 1 \, \text{N} \]

**Conclusion:** This statement is **correct**.

### Step 4: Analyze the fourth statement
**Statement:** "Molality of a solution relates moles of solute and mass of solvent."

**Analysis:**
- As previously defined, molality is indeed defined as the number of moles of solute per kilogram of solvent.
- This statement accurately reflects the definition of molality.

**Conclusion:** This statement is **correct**.

### Final Conclusion
The incorrect statement among the options provided is the first statement: "Molality of a solution is dependent on the temperature."