Question:
Which of the following solutions has maximum vapour pressure?
Which of the following solutions has maximum vapour pressure?
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Vapour pressure is highest for the solution with the lowest solute concentration.
Updated On: Nov 12, 2026
- 1 M copper sulphate solution
- 0.01 M copper sulphate solution
- 0.5 M copper sulphate solution
- 2 M copper sulphate solution
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Lowering of vapour pressure is a colligative property. It increases with the number of solute particles in a fixed amount of solvent.
Step 2: Compare the solutions
All four solutions are copper sulphate, so the van't Hoff factor is the same. Only the concentration differs: 2 M, 1 M, 0.5 M and 0.01 M.
Step 3: Conclusion
The 0.01 M solution has the smallest lowering, so its vapour pressure is closest to that of pure water and is the highest.
Final Answer:
The 0.01 M copper sulphate solution has the maximum vapour pressure. \[ \boxed{\text{(B) }\text{0.01 M copper sulphate solution}} \]
Lowering of vapour pressure is a colligative property. It increases with the number of solute particles in a fixed amount of solvent.
Step 2: Compare the solutions
All four solutions are copper sulphate, so the van't Hoff factor is the same. Only the concentration differs: 2 M, 1 M, 0.5 M and 0.01 M.
Step 3: Conclusion
The 0.01 M solution has the smallest lowering, so its vapour pressure is closest to that of pure water and is the highest.
Final Answer:
The 0.01 M copper sulphate solution has the maximum vapour pressure. \[ \boxed{\text{(B) }\text{0.01 M copper sulphate solution}} \]
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