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Problem The electrode with reaction : Cr 2 O 7 2 − ( aq. ) + 14 H + ( aq. ) + 6 e ⟶ 2 Cr 3 + ( aq. ) + 7 H 2 O \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} Cr 2 O 7 2 − ( aq. ) + 14 H + ( aq. ) + 6 e ⟶ 2 Cr 3 + ( aq. ) + 7 H 2 O ; can be represented as :
a. Pt ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. ) \text{Pt} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.}) Pt ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. )
b. Pt ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. ) , Cr 3 + ( aq. ) \text{Pt} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.}), \text{Cr}^{3+}(\text{aq.}) Pt ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. ) , Cr 3 + ( aq. )
c. Pt H 2 ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. ) \text{Pt}_{\text{H}_2} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.}) Pt H 2 ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. )
d. Pt H 2 ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. ) , Cr 3 + ( aq. ) \text{Pt}_{\text{H}_2} | \text{H}^+(\text{aq.}), \text{Cr}_2\text{O}_7^{2-}(\text{aq.}), \text{Cr}^{3+}(\text{aq.}) Pt H 2 ∣ H + ( aq. ) , Cr 2 O 7 2 − ( aq. ) , Cr 3 + ( aq. )
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