Consider the following statements:
1. Addition of salt to pure water increases the boiling point of water and decreases the freezing point of water.
2. When methyl alcohol is added to water boiling point of water decreases.
Which of the above statements is/are correct?
- A1 only
- B2 only
- CBoth 1 and 2
- DSalt and methyl alcohol are same in behaviour
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (c) Both 1 and 2
Explanation
Adding salt (NaCl) to water causes boiling point elevation and freezing point depression – Statement 1 is correct.
These are colligative properties that depend on the number of dissolved solute particles.
Adding volatile methyl alcohol lowers water's boiling point, since the volatile solute raises the vapour pressure – Statement 2 is correct.