मराठी
Maharashtra State BoardHSC Science (Electronics) 12th Standard Board Exam
प्रश्नपत्रिका२५४
पाठ्यपुस्तक उत्तरे१०२९३
MCQ ऑनलाइन सराव परीक्षा६०
महत्वाचे प्रश्न आणि उत्तरे७७९६
संकल्पना स्पष्टीकरण आणि व्हिडिओ४५३
टाइम टेबल३३
अभ्यासक्रम

Electrode Potential and Cell Potential

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Definition: Electrode Potential

The potential difference developed between the electrode and the electrolyte due to the loss or gain of electrons by the electrode is called the electrode potential.

Oxidation potential: M(s) ⇌ Mⁿ⁺(aq) + ne⁻ Reduction potential: Mⁿ⁺(aq) + ne⁻ ⇌ M(s) Reduction potential = − Oxidation potential

Maharashtra State Board: Class 12

Definition: Cell Potential

The cell potential of the cell is the algebraic sum of the electrode potentials. Cell potential is called the electromotive force (e.m.f.) of the cell when no current is drawn through the cell.

Maharashtra State Board: Class 12

Definition: Standard electrode potential (E°)

Standard electrode potential is the potential associated with the electrode reaction at an electrode when all solutes are 1 M, and all gases are at 1 atm and at 25°C (298 K).

Maharashtra State Board: Class 12

Definition: Standard cell potential (E°cell)

It is the cell potential when the concentrations of all the species are 1 M at 25°C, and the pressure of the gas involved is 1 atm at 25°C.

Maharashtra State Board: Class 12

Key Points: Prediction of Reaction

ΔG° E°cell Nature
ΔG° < 0 E°cell > 0 Spontaneous
ΔG° = 0 E°cell = 0 Equilibrium
ΔG° > 0 E°cell < 0 Non-spontaneous

Related QuestionsVIEW ALL [25]

Calculate `"E"_"cell"^circ` of the following galvanic cell:

Mg(s) / Mg2+(1 M) // Ag+ (1 M) / Ag(s) if `"E"_"Mg"^circ` = – 2.37 V and `"E"_"Ag"^circ` = 0.8 V. Write cell reactions involved in the above cell. Also mention if cell reaction is spontaneous or not.

Write net cell reaction.

Construct a cell from Ni2+ | Ni and Cu2+ | Cu Cu half cells. Write the cell reaction and calculate `E_("cell")^0`   
`(E_("Ni")^0 = - 0.236  V and E_("Cu")^0 = + 0.337  V)`

What is the ΔG0 for the following reaction?

\[\ce{Al_{(s)} + Fe^{3+}_{( aq)} -> Al^{3+}_{( aq)} + Fe_{(s)}}\]; \[\ce{E^0_{cell}}\] = +2.43

The standard potential of the cell in the following reaction is ______.

\[\ce{Cd_{(s)} + Cu^{2+}_{(1M)} -> Cd^{2+}_{(1M)} + Cu_{(s)}}\]

`("E"_("Cd")^circ = - 0.403V, "E"_("Cu")^circ = 0.334V)`

Write the four applications of emf series.

Answer the following:

Calculate emf of the cell:

Zn(s) |Zn2+ (0.2 M)||H+ (1.6 M)| H2(g, 1.8 atm)| Pt at 25 °C.

The standard potential of the electrode Zn2+(0.02M) |Zn(s) is − 0.76 V. Calculate the electrode potential of the zinc electrode.

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