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NEET CHEMISTRYSolutionsEasy

Question

An aqueous solution is 1.001.00 molal in KI\text{KI}. Which change will cause the vapour pressure of the solution to increase?

A

Addition of NaCl\text{NaCl}

B

Addition of Na2SO4\text{Na}_2\text{SO}_4

C

Addition of 1.001.00 molal KI\text{KI}

D

Addition of water

Step-by-Step Solution

According to Raoult's law, the relative lowering of vapour pressure is directly proportional to the mole fraction of the solute. Adding more solute (like NaCl\text{NaCl}, Na2SO4\text{Na}_2\text{SO}_4, or KI\text{KI}) increases the number of solute particles, which further lowers the vapour pressure. On the other hand, adding water (solvent) dilutes the solution, decreases the mole fraction of the solute, and consequently increases the vapour pressure of the solution.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Solutions. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYSolutionsaqueoussolutiontextkichangevapour

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