Consider which can be expressed is degree (temperature) are

Options

A. III,IV
B. I,II
C. I,II,III
D. I,III

Explanation

To solve the question regarding the expression of changes in boiling point in terms of temperature (degrees), we will follow these steps:

### Step 1: Understand the Formula for Boiling Point Elevation
The boiling point elevation can be expressed using the formula:
\[ \Delta T_b = i \cdot K_b \cdot m \]
Where:
- \(\Delta T_b\) = change in boiling point
- \(i\) = van 't Hoff factor (number of particles the solute breaks into)
- \(K_b\) = molal boiling point elevation constant
- \(m\) = molality of the solution

### Step 2: Identify the Components of the Formula
- The term \(K_b\) is the molal boiling point elevation constant, which is expressed in units of °C kg/mol.
- The molality \(m\) is expressed in moles of solute per kilogram of solvent.

### Step 3: Analyze the Units
From the formula:
- The product \(K_b \cdot m\) gives a value in degrees Celsius (°C) because:
- \(K_b\) has units of °C kg/mol
- \(m\) has units of mol/kg
- Thus, \(K_b \cdot m\) results in °C, and when multiplied by \(i\), which is dimensionless, \(\Delta T_b\) is also in °C.

### Step 4: Expressing the Change in Boiling Point
Since \(\Delta T_b\) is in degrees, we can say:
\[ \Delta T_b = i \cdot K_b \cdot m \text{ can be expressed in degrees (°C)} \]

### Step 5: Conclusion
Therefore, the change in boiling point, as well as the components \(K_b\) and \(m\), can all be expressed in terms of degrees (temperature).

### Final Answer
1. \(\Delta T_b\) can be expressed in degrees.
2. \(K_b\) can be expressed in terms of degrees.
3. \(m\) can also be expressed in terms of degrees.