Practice MCAT Question - Q38 - 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.
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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.
