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At a given dilution, the van't Hoff factor i for complete dissociation approaches which value for K2SO4 in water?
A2
B3
C1
D4
Answer & Solution
Correct answer: B. 3
1. K2SO4 dissociates as $K_2SO_4 \rightarrow 2K^+ + SO_4^{2-}$, giving 3 ions per formula unit.
2. For complete dissociation, i equals the number of particles produced.
3. Hence i approaches 3 (compared with 2 for NaCl, KCl and MgSO4).
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.24_
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