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Per NCERT eqn 7.54, the balanced reduction half-reaction for Cr₂O₇²⁻ in acidic medium gains how many electrons?
A12 e⁻
B3 e⁻
C14 e⁻
D6 e⁻
Answer & Solution
Correct answer: D. 6 e⁻
NCERT eqn 7.54: each Cr 6→3 gains 3 e⁻; two Cr → 6 e⁻ total.
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