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Question: Answered & Verified by Expert
A mixture of three compounds $A, B, C$ is passed through a column of $\mathrm{Al}_2 \mathrm{O}_3$ by using alcohol as eluant. The order in which they are eluted out of the column is $C, B, A$. Which of the following statement is true?
ChemistrySurface ChemistryAP EAMCETAP EAMCET 2020 (22 Sep Shift 2)
Options:
  • A ' $C$ ' is strongly adsorbed on the adsorbent
  • B ' $C$ ' is weakly adsorbed on the adsorbent
  • C ' $A$ ' is weakly adsorbed on the solvent
  • D The order or elution does not depend on the extent of adsorption
Solution:
1009 Upvotes Verified Answer
The correct answer is: ' $C$ ' is weakly adsorbed on the adsorbent
Since, compound $C$ comes out before $B . B$ is more readily adsorbed to the column and ' $B$ ' comes out before $A$. Hence, $A$ is more readily adsorbed than $B$. Hence, order of adsorption is $A>B>C$. Hence, $C$ is weakly adsorbed on the adsorbent. Thus, the correct option is (b).

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