Express the terms representing the following formulae .
(i)`"No. of moles of solute"/"Volume of solution in litres"=(W)`
(ii)`"No. of moles of solute"/"Mass of solvent in kg"=(X)`
(iii)`"No. of moles of component"/"Moles in the solution"=(Y)`
(iv)`"Mass of component"/"Mass of solution"=(Z)`

Options

A. W-Molality , X-Molarity , Y-Mass fraction, Z-Mole fraction
B. W-Molarity , X-Molality , Y-Mass fraction, Z-Mole fraction
C. W-Molarity , X-Molality , Y-Mole fraction, Z-Mass fraction
D. W-Molality , X-Molarity , Y-Mass fraction, Z-Mass fraction

Answer

To express the terms representing the given formulae, we will analyze each formula step by step.

### Step-by-Step Solution:

1. **Formula (i)**:
\[ \text{No. of moles of solute} / \text{Volume of solution in litres} = W \]
- This formula represents **Molarity (M)**, which is defined as the number of moles of solute per liter of solution.
- Thus, we can express \( W \) as:
\[ W = \text{Molarity} \]

2. **Formula (ii)**:
\[ \text{No. of moles of solute} / \text{Mass of solvent in kg} = X \]
- This formula represents **Molality (m)**, which is defined as the number of moles of solute per kilogram of solvent.
- Thus, we can express \( X \) as:
\[ X = \text{Molality} \]

3. **Formula (iii)**:
\[ \text{No. of moles of component} / \text{Moles in the solution} = Y \]
- This formula represents **Mole Fraction (χ)**, which is defined as the ratio of the number of moles of a component to the total number of moles in the solution.
- Thus, we can express \( Y \) as:
\[ Y = \text{Mole Fraction} \]

4. **Formula (iv)**:
\[ \text{Mass of component} / \text{Mass of solution} = Z \]
- This formula represents **Mass Fraction (ω)**, which is defined as the ratio of the mass of a component to the total mass of the solution.
- Thus, we can express \( Z \) as:
\[ Z = \text{Mass Fraction} \]

### Final Summary:
- \( W = \text{Molarity} \)
- \( X = \text{Molality} \)
- \( Y = \text{Mole Fraction} \)
- \( Z = \text{Mass Fraction} \)