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Consider the half reactions with standard potentials. i. AgA(aq)⊕+eA⊖⟶AgA(s)EA∘= 0.8V ii. IA2A(s)+2eA⊖⟶2IA⊖A(aq) EA∘= 0.53V iii. PbA2⊕A(aq)+2eA⊖⟶PbA(s) EA∘=−0.13V iv. FeA2⊕+2eA⊖⟶FeA(s) EA∘=−0.44V The

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प्रश्न

Consider the half reactions with standard potentials.

  1. \[\ce{Ag^{\oplus}_{ (aq)} + e^{\ominus} -> Ag_{(s)}E^\circ = 0.8 V}\] 
  2. \[\ce{I2_{(s)} + 2e^\ominus -> 2I^{\ominus}_{(aq)} E^\circ = 0.53V}\]
  3. \[\ce{Pb^{2\oplus}_{(aq)} + 2e^{\ominus} -> Pb_{(s)} E^\circ = -0.13 V}\]
  4. \[\ce{Fe^{2\oplus} + 2e^{\ominus} -> Fe_{(s)} E^\circ = -0.44 V}\]

The strongest oxidising  and reducing agents respectively are ______.

विकल्प

  • \[\ce{Ag and Fe^{2\oplus}}\]

  • \[\ce{Ag^{\oplus} and Fe}\]

  • \[\ce{Pb^{2\oplus} and I}\]

  • \[\ce{I2 and Fe^{2\oplus}}\]

MCQ
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उत्तर

The strongest oxidising  and reducing agents respectively are \[\ce{Ag^{\oplus} and Fe}\].

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अध्याय 5: Electrochemistry - Exercises [पृष्ठ ११७]

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बालभारती Chemistry [English] Standard 12 Maharashtra State Board
अध्याय 5 Electrochemistry
Exercises | Q 1.06 | पृष्ठ ११७

संबंधित प्रश्न

Choose the most correct option.

The standard potential of the cell in which the following reaction occurs:
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`("E"_"Cu"^circ = 0.34 "V")` is


Answer the following in one or two sentences.

What is standard cell potential for the reaction

\[\ce{3Ni_{(s)} + 2Al^{3+} (1M) → 3Ni^{2+} (1M) + 2Al(s)}\], if `E_"Ni"^circ` = –0.25 V and  `"E"_("Al")^circ` = –1.66 V?


Answer the following in one or two sentences.

Write Nernst equation. What part of it represents the correction factor for nonstandard state conditions?


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.


Calculate emf of the cell at 25°C.

Zn(s) | Zn2+ (0.08 M) || Cr3+ (0.1 M) | Cr(s)

`E_(Zn)^0` = −0.76 V,  `E_(Cr)^0` = −0.74 V


Answer the following:

Predict whether the following reaction would occur spontaneously under standard state condition.

`"Ca"_(("s")) + "Cd"_(("aq"))^(2+) -> "Ca"_(("aq"))^(2+) + "Cd"_(("s"))`


What is cell voltage?


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.


Standard reduction electrode potentials of three metals A, B and C are +0.5 V, −3.0 V and −1.2 V respectively. The reducing power of these metals is ______.


Nernst equation for the following cell reaction at 298 K is:

\[\ce{Mg_{(s)} | Mg^{2+}_{( aq)} || Ag^+_{( aq)} | Ag_{(s)}}\]


What is the standard emf of the following cell?

\[\ce{Ni_{(s)} | Ni^{2+}_{( aq)} || Au^{3+}_{( aq)} | Au_{(s)}}\]

if \[\ce{E^0_{Ni}}\] = −0.25 V, \[\ce{E^0_{Au}}\] = 1.50 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


For the following cell, standard potential of copper electrode is 0.337 V and standard cell potential is 0.463 V.

\[\ce{Cu | Cu^{2+} (1 M) || Ag^+ (1 M)  Ag}\]

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What is the standard potential of cell, Ni | Ni2+ (1M) || Cu2+ (1 M) | Cu?

If E°Cu = 0.337 V and E°Ni = - 0.236 V.


The standard electrode potential of Zn and Ni are - 0.76 V and - 0.25 V respectively. If the reaction takes place in the cell constructed between these two electrodes is spontaneous. What is the standard emf of the cell?


The tendency of an electrode to lose electrons is known as ______


Answer the following in one or two sentences.

What is the standard cell potential for the reaction?

\[\ce{2Al(s) + 3Ni^{2⊕}(1M) -> 2Al^{3⊕}(1 M) + 3Ni(s)}\]

if \[\ce{E{^{\circ}_{Ni}}}\] = −0.25 V and \[\ce{E{^{\circ}_{Al}}}\] = −1.66 V?


Which element from the following has the highest negative standard reduction potential?


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Define standard electrode potential.


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Zn(s)|Zn2+(0.08 M) || Cu2+(0.l M) |Cu(s)

E0zn = − 0.76 V, E0cu = 0.36 V.


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What is the reduction potential of hydrogen gas electrode when pure hydrogen gas is at 1 atmosphere pressure and platinum electrode is in contact with HCI of pH 2 at 298 K?


The cell potential for the following cell notation is approximately:

M(s) | M3+ (aq, 0.01 M) || N2+ (aq, 0.1 M) | N(s)

`E_(M^(3+)//M)^0` = 0.6 V and `E_(N^(2+)//N)^0` = 0.1 V


Which from following is CORRECT expression for Ecell of following cell?

\[\ce{Pb_{(s)} | Pb^++_{(1 m)} || Ag^+_{(0.1 m)} | Ag_{(g)}}\] at 25°C?


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