Which of the following statement is true?

Options

A. Passage of solvent molecules towards high concentration solution side through semipermeable membrane is osmosis
B. Passage of solute molecules towards solution side through semipermeable membrane is osmosis.
C. The boiling point of a solution is always lower than that of pure solvent
D. The boiling point of a liquid is the temperature at which its vapour pressure becomes equal to 260 mm

Explanation

To determine which of the given statements is true, we will analyze each statement one by one based on the principles of solutions and colligative properties.

### Step-by-Step Solution:

1. **Understanding Osmosis**:
- The first statement describes osmosis as the passage of solvent molecules from a region of high concentration to a region of low concentration through a semi-permeable membrane.
- This definition is correct because osmosis specifically refers to the movement of solvent (usually water) from an area of lower solute concentration to an area of higher solute concentration.

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