Which of the following statements is false?

Options

A. Units of atmospheric pressure and osmotic pressure are the same
B. In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration
C. The value of mole depression constant depends on nature of solvent
D. Relataive lowering of vapour pressure, is a dimesionless quantity

Explanation

To determine which of the statements is false, we will analyze each statement one by one.

### Step 1: Analyze Statement 1
**Statement:** "Units of atmospheric pressure and osmotic pressure are the same."

**Analysis:**
- Atmospheric pressure is measured in units such as atmospheres (atm), pascals (Pa), or mmHg.
- Osmotic pressure is also measured in the same units (atm, Pa, mmHg).
- Therefore, this statement is **true**.

### Step 2: Analyze Statement 2
**Statement:** "In reverse osmosis, solvent molecules move through a semi-permeable membrane from a region of lower concentration of solute to a region of higher concentration."

**Analysis:**
- In reverse osmosis, the process is the opposite of osmosis. Solvent molecules move from a region of **higher concentration of solute** to a region of **lower concentration of solute**.
- This statement is **false** because it incorrectly describes the direction of solvent movement in reverse osmosis.

### Step 3: Analyze Statement 3
**Statement:** "The value of mole depression constant depends on the nature of solvent."

**Analysis:**
- The mole depression constant (also known as the ebullioscopic or cryoscopic constant) is indeed specific to each solvent and depends on the nature of the solvent.
- Therefore, this statement is **true**.

### Step 4: Analyze Statement 4
**Statement:** "Relative lowering of vapor pressure is a dimensionless quantity."

**Analysis:**
- Relative lowering of vapor pressure is defined as the change in vapor pressure divided by the original vapor pressure, which results in a ratio. Since it is a ratio of two pressures, it is dimensionless.
- Therefore, this statement is **true**.

### Conclusion
After analyzing all statements, we find that:
- Statement 1: True
- Statement 2: **False**
- Statement 3: True
- Statement 4: True

Thus, the false statement is **Statement 2**.

### Final Answer
The false statement is: **In reverse osmosis, solvent molecules move through a semi-permeable membrane from a region of lower concentration of solute to a region of higher concentration.**

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