Question

Number of electrons involved in the reduction of $Cr_{2}O_{7}^{2 -}$ ion in acidic solution to Cr³⁺ is –

• A. 3
• B. 4
• C. 2
• D. 6

Answer 1

Answer: (D)

6

Answer 2

$Cr_{2}^{6 +}$ + 6e ® 2Cr³⁺