The electrode with reaction : ; can be represented as :

CHEMISTRY · Single correct · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

The electrode with reaction :

\text{Cr}_2\text{O}_7^{2-}(\text{aq.}) + 14\text{H}^+(\text{aq.}) + 6e \longrightarrow 2\text{Cr}^{3+}(\text{aq.}) + 7\text{H}_2\text{O}

; can be represented as : (1)

\text{Pt} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.})

(2)

\text{Pt} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.}), \text{Cr}^{3+}(\text{aq.})

(3)

\text{Pt}_{\text{H}_2} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.})

(4)

\text{Pt}_{\text{H}_2} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.}), \text{Cr}^{3+}(\text{aq.})