Question on practice DAT by ADA

[orangepopsicle]

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This question was on the practice DAT for ADA, could someone please explain?


During a titration it was determined that
30.00 mL of a 0.100 M Ce4+ solution was
required to react completely with 20.00
mL of a 0.150 M Fe2+ solution. Which
reaction occurred?

A. Ce4+ + 3Fe2+ + H2O 3Fe3+
+ CeO- + 2H+
B. 2Ce4+ + Fe2+ Fe4+ + 2Ce3+
C. Ce4+ + Fe2+ Fe3+ + Ce3+
D. Ce4+ + 2Fe2+ 2Fe3+ + Ce2+
E. Ce4+ + 2Fe2+ 2Fe4+ + Cs2+ 2e-

 

[DoCt0rPeTe]

This question was on the practice DAT for ADA, could someone please explain?


During a titration it was determined that
30.00 mL of a 0.100 M Ce4+ solution was
required to react completely with 20.00
mL of a 0.150 M Fe2+ solution. Which
reaction occurred?

A. Ce4+ + 3Fe2+ + H2O 3Fe3+
+ CeO- + 2H+
B. 2Ce4+ + Fe2+ Fe4+ + 2Ce3+
C. Ce4+ + Fe2+ Fe3+ + Ce3+
D. Ce4+ + 2Fe2+ 2Fe3+ + Ce2+
E. Ce4+ + 2Fe2+ 2Fe4+ + Cs2+ 2e-

This was discussed a few weeks ago. I doubt it will appear on a newer version of the DAT but I guess its worth it to take a shot at it.

http://forums.studentdoctor.net/showthread.php?t=755840