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Standard emf of a cell, or one electrode potential, from E cell = E cathode - E anode

This type of question, asked 15 times: 10 May 2023 S2, 15 May 2023 S1, 16 May 2023 S1, 9 May 2024 S2, 10 May 2024 S2, 11 May 2024 S2, 13 May 2024 S2, 14 May 2024 S2, 22 Apr 2025 S1, 22 Apr 2025 S2, 15 Apr 2026 S2, 17 Apr 2026 S1, 12 May 2026 S1, 13 May 2026 S1, 14 May 2026 S1. All 15 questions below, oldest first.

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  1. Question 1

    10 May 2023 S2

    97
    Calculate the Ecell∘E^\circ_{\text{cell}} of Al∣Al2(SO4)3(1M)∥HCl(1M)∣H2(g)(1 atm),Pt\text{Al} | \text{Al}_2(\text{SO}_4)_3(1\text{M}) \| \text{HCl}(1\text{M}) | \text{H}_2(\text{g})(1\,\text{atm}), \text{Pt}. (Given EAl3+∣Al∘=−1.66E^\circ_{\text{Al}^{3+}|\text{Al}} = -1.66 V)

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  2. Question 2

    15 May 2023 S1

    68
    The Ecell∘E^\circ_{\text{cell}} of Cu(s)∣Cu(1 M)2+∥Ag(1 M)+∣Ag(s)\text{Cu}_{(s)} \mid \text{Cu}^{2+}_{(1\,M)} \parallel \text{Ag}^{+}_{(1\,M)} \mid \text{Ag}_{(s)} is 0.647 volt. Calculate the EAg∘E^\circ_{\text{Ag}} if ECu∘E^\circ_{\text{Cu}} is 0.153 V.

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  3. Question 3

    16 May 2023 S1

    82
    Consider the following cell: Zn(s)∣Zn(1M)2+∣∣KCl(sat)∣Hg2Cl2∣Hg\text{Zn}_{(s)}|\text{Zn}^{2+}_{(1M)}||\text{KCl}_{(sat)}|\text{Hg}_2\text{Cl}_2|\text{Hg}. E°cell=1.007 VE°_{\text{cell}} = 1.007\,\text{V} and E°calomel=0.242 VE°_{\text{calomel}} = 0.242\,\text{V}. What is the standard potential of Zn?

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  4. Question 4

    9 May 2024 S2

    84
    A reaction Ni(s)+Cu2+(aq)→Ni2+(aq)+Cu(s)\text{Ni(s)} + \text{Cu}^{2+}(\text{aq}) \to \text{Ni}^{2+}(\text{aq}) + \text{Cu(s)} occurs in a cell. Calculate Ecell∘E^\circ_{cell} if ECu∘=0.337E^\circ_{Cu} = 0.337 V and ENi∘=−0.257E^\circ_{Ni} = -0.257 V.

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  5. Question 5

    10 May 2024 S2

    90
    Calculate Ecell∘E^\circ_{\text{cell}} in which following reaction occurs: Mg(s)+2Ag+(aq)→Mg2+(aq)+2Ag(s)\text{Mg}(s)+2\text{Ag}^+(aq)\rightarrow\text{Mg}^{2+}(aq)+2\text{Ag}(s) if EAg∘=0.8 VE^\circ_{Ag}=0.8\,V and EMg∘=−2.37 VE^\circ_{Mg}=-2.37\,V

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  6. Question 6

    11 May 2024 S2

    85
    Calculate the Ecell∘E^\circ_\text{cell} for Zn(s)∣Zn2+(1M)∥Cd2+(1M)∣Cd(s)\text{Zn}(s)|\text{Zn}^{2+}(1\text{M})\|\text{Cd}^{2+}(1\text{M})|\text{Cd}(s) at 25∘C25^{\circ}\text{C}. EZn∘=−0.763 VE^\circ_{\text{Zn}} = -0.763\text{ V}; ECd∘=−0.403 VE^\circ_{\text{Cd}} = -0.403\text{ V}

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  7. Question 7

    13 May 2024 S2

    65
    Calculate Ecell∘E^\circ_{\text{cell}} for Zn(s)∣Zn2+(1M)∣∣Pb2+(1M)∣Pb(s)\text{Zn(s)}|\text{Zn}^{2+}(1\text{M})||\text{Pb}^{2+}(1\text{M})|\text{Pb(s)} if EZn∘=−0.763 VE^\circ_{\text{Zn}}=-0.763\ \text{V} and EPb∘=−0.126 VE^\circ_{\text{Pb}}=-0.126\ \text{V}

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  8. Question 8

    14 May 2024 S2

    56
    Calculate E°cellE°_{cell} for Cd(s)∣Cd2+(1M)∥Ag+(1M)∣Ag(s)\text{Cd}(s)|\text{Cd}^{2+}(1M)\|\text{Ag}^+(1M)|\text{Ag}(s). E°Cd=−0.403 VE°_{Cd} = -0.403\,\text{V}; E°Ag=0.799 VE°_{Ag} = 0.799\,\text{V}

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  9. Question 9

    22 Apr 2025 S1

    87
    If standard reduction potential (E∘E^{\circ}) of (Ni(aq)+2∣Ni(s))\left( Ni_{\left( aq \right)}^{+ 2}\mid Ni_{\left( s \right)} \right) and (Al(aq)+3∣Al(s))\left( Al_{\left( aq \right)}^{+ 3}\mid Al_{\left( s \right)} \right) are -0.25 V and -1.66 V respectively. What is standard emf of cell reaction 2Al(s)+3Ni(aq)+2⟶2Al(aq)+3+3Ni(s)2Al_{\left( s \right)}+ 3Ni_{\left( aq \right)}^{+ 2}\longrightarrow 2Al_{\left( aq \right)}^{+ 3}+ 3Ni_{\left( s \right)}

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  10. Question 10

    22 Apr 2025 S2

    54
    If E∘(Fe(aq)+2∣Fe(s))=−0.44 VE^{\circ}\left( Fe_{(aq)}^{+ 2}\mid Fe_{(s)} \right)= - 0.44\text{ }V and E∘(Sn(eq)+2∣Sn(s))=−0.14 VE^{\circ}\left( Sn_{(eq)}^{+ 2}\mid Sn_{(s)} \right)= - 0.14\text{ }V. What is standard emf of cell containing the two electrodes?

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  11. Question 11

    15 Apr 2026 S2

    25
    The Ecell0E^0_{\text{cell}} of Al(s)∣Al3+(1M)∣∣Pb2+(1M)∣Pb(s)\mathrm{Al_{(s)}|Al^{3+}(1M)||Pb^{2+}(1M)|Pb_{(s)}} cell is 1.5 V if EPb0E^0_{\text{Pb}} is −0.14-0.14 V then EAl0E^0_{\text{Al}} will be

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  12. Question 12

    17 Apr 2026 S1

    24
    If the emf of cell, Cu(s) ∣ Cu(1M)2+ ∣∣ Ag(1M)+ ∣ Ag\mathrm{Cu_{(s)}\,|\,Cu^{2+}_{(1M)}\,||\,Ag^+_{(1M)}\,|\,Ag} is 0.463 V at 25 ∘C25\ ^\circ\mathrm{C} and standard potential of Cu electrode is 0.337 V. Find the standard potential of Ag electrode

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  13. Question 13

    12 May 2026 S1

    24
    Calculate EcelloE^o_{cell} of the following cell at 298298 K. Pb(s) ∣ Pb(aq)+2 ∣∣ Ag(aq)+ ∣ Ag(s)\mathrm{Pb_{(s)}\,|\,Pb^{+2}_{(aq)}\,||\,Ag^+_{(aq)}\,|\,Ag_{(s)}} EoPb+2/Pb=−0.126E^o\mathrm{Pb^{+2}/Pb} = -0.126 V, Eo Ag+/Ag=+0.799E^o\ \mathrm{Ag^+/Ag} = +0.799 V

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  14. Question 14

    13 May 2026 S1

    24
    The standard EMF of the cell, Ni | Ni2+\mathrm{Ni^{2+}} || Cu2+\mathrm{Cu^{2+}} | Cu is 0.590.59 Volt. The standard reduction potential of a copper electrode is 0.340.34 volt. What is the standard electrode potential of nickel electrode ?

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  15. Question 15

    14 May 2026 S1

    23
    Calculate the standard potential of the cell that has the following reaction. Zn(s)+2H(1M)+→H2(g,1atm)+Zn(1M)2+\mathrm{Zn_{(s)} + 2H^+_{(1M)} \rightarrow H_{2(g,1atm)} + Zn^{2+}_{(1M)}} if E0(Zn2+/Zn)=−0.763E^0(\mathrm{Zn^{2+}/Zn}) = -0.763 V.

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