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MCAT Question A Day - 8/21/13 - Answer!

Current in an ionized gas sample depends on

A.  cations only.
B.  anions only.
C.  free electrons only.
D.  cations, anions, and free electrons.

The correct answer is (D). Conductivity in solids is due to free electrons; in electrolytic solutions, it is due to ions; in ionized gases, it is due to both ions and free electrons.