Chemistry · Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure
Assertion Van't Hoff factor for solute showing dissociation is always greater th
Assertion Van't Hoff factor for solute showing dissociation is always greater than for solute showing association. Reason Dissociation leads to increase in number of particles whereas, association leads to a decrease in number of particles.
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
The Van't Hoff factor (i) is >1 for dissociation (more particles) and <1 for association (fewer particles), so any dissociating solute has i > any associating solute. The Reason correctly states that dissociation increases particles while association decreases them, which directly explains why i(diss)>i(assoc).
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