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Q.

The number of electrons lost in the following change is Fe + H2O  →  Fe3O4 + H2

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a

2

b

4

c

6

d

8

answer is D.

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Detailed Solution

3 Fe  +  8e-  →   Fe8/3+3                 2H⊕ →  H2 + 2e- × 4 ________________________________ 3Fe + 4H2O  →  Fe3O4 +  4H2 ________________________________The number of electrons lost or gained is 8.
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