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AP EAMCET202022 Sep 2020Evening ShiftChemistrySurface ChemistryActual

A mixture of three compounds A, B, C is passed through a column of Al ₂ 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?

Options

  1. A' C ' is strongly adsorbed on the adsorbent
  2. B' C ' is weakly adsorbed on the adsorbent
  3. C' A ' is weakly adsorbed on the solvent
  4. DThe order or elution does not depend on the extent of adsorption

Correct answer

B. ' C ' is weakly adsorbed on the adsorbent

Step-by-step solution

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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