Q. The number of electrons lost or gained during the change $Fe + H_{2}O\ \rightarrow {Fe}_{3}O_{4} + H_{2}$ is
A) 2
B) 4
C) 6
D) 8
Explanation
(d)
$3Fe \rightarrow {Fe}_{3}O_{4} + 8e^{-}\ oxidation$
$4H_{2}O + 8e^{-} \rightarrow 4H_{2}$
Thus, there are lose of 8 electrons in the reaction
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.