X⁻,Y⁻,and Z⁻ Are Separated with an Anion Exchange Column with a Mobile

X⁻,Y⁻,and Z⁻ are separated with an anion exchange column with a mobile phase containing A⁻.The strength,which the anions bind to the column,is Y⁻ > X⁻ > Z⁻ > A⁻.To elute the anions,the concentration of A⁻ is____________________ ,with____________________ eluting first,____________________ eluting second,and____________________ eluting last.

A) decreased;Y⁻;X⁻;Z⁻
B) increased;Z⁻;X⁻;Y⁻
C) decreased;Z⁻;X⁻;Y⁻
D) increased;Y⁻;X⁻;Z⁻
E) increased;X⁻;Y⁻;Z⁻

Correct Answer:

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