D-And F-Block Elements Ques 71
Question: In the reduction of dichromate by $ Fe(II) $ the number of electrons involved per chromium atom is
[Pb. PMT 2001]
Options:
A) 2
B) 3
C) 4
D) 1
Show Answer
Answer:
Correct Answer: B
Solution:
$Cr_2O^{2−}_7+6e^−+14H^+→2Cr^{3+}+7H_2O$
So, 3 electrons per Cr atom is used.