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JEE Main levelOne or more correct optionsDifficulty 2 of 3so195

Which statements about the van't Hoff factor $i$ are correct?

AFor complete dissociation of $Al X_{2} (SO X_{4}) X_{3}$ in water, $i = 3$
BFor a solute that associates in solution, $i < 1$
CFor a solute that dissociates in solution, $i > 1$
DFor a non-volatile solute that neither dissociates nor associates, $i = 0$

Answer: B, C

Dissociation increases the number of particles (

i > 1

) and association decreases it (

i < 1

). A non-dissociating, non-associating solute has

i = 1

, not

0

.

Al X_{2} (SO X_{4}) X_{3} 2 Al X^{3 +} + 3 SO X_{4} X^{2 -}

gives 5 ions, so

i = 5

, not 3.

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