Given below are the half - cell reactions : Mn 2 + + 2 e - → Mn ; E ∘ = - 1.18 V 2 Mn 3 + + e - → Mn 2 + ; E ∘ = + 1.51 V The E ∘ for 3 Mn 2 + → Mn + 2 Mn 3 + will be :

- 2.69 V ; the reaction will not occur

- 2.69 V ; the reaction will occur

- 0.33 V ; the reaction will not occur

- 0.33 V ; the reaction will occur

Consider the following standard electrode potentials ( E o in volts) in aqueous solution: E l e m e n t M 3 + / M M + / M A l - 1.66 + 0.55 T l + 1.26 - 0.34 Based on these data, which of the following statements is correct?

T l + is more stable than A l +

T l + is more stable than A l 3 +

A l + is more stable than A l 3 +

T l 3 + is more stable than A l 3 +

EASY

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The half-cell potentials for the metallic elements A, B, C and D are 0.8V, –0.74V, 1.1V and +0.34V respectively. Arrange these in the order of decreasing metallic character

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Important Questions on Redox Reactions

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Hypophosphorus acid is a good reducing agent because

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

The hydrogen electrode is dipped in a solution of

pH = 3 at 25 ° C

, the potential of the cell would be (the value of

\frac{2.303 RT}{F} = 0.059 V

)

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

The electrode potential of

M^{2 +} / M

3

d-series elements shows positive value for?

HARD

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

Question Image

Name the cation that remains as a spectator ion in the solution.

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

The amount of

A g

(atomic mass = 108) deposited at the cathode when a current of 0.5 amp is passed through a solution of

A g N O_{3}

for 1 hour is closest to

HARD

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

Question Image

Which equation for the reaction at the anode is correct?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

In the following resonance structures, the curved arrow indicates that electrons are shifted from

Question Image

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Given

E_{{Cl}_{2} / {Cl}^{-}}^{o} = 1 .36 V, E_{{Cr}^{3 +} / Cr}^{o} = - 0 .74 V

E_{{Cr}_{2} O_{7}^{2 -} / {Cr}^{3 +}}^{o} = 1 .33 V, E_{{MnO}_{4}^{-} / {Mn}^{2 +}}^{o} = 1 .51 V .

Among the following, the strongest reducing agent is:

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

What is the standard potential of cell

Ni ∣ {Ni}^{2 +} (1 M) ‖ {Cu}^{2 +} (1 M) | Cu

{E^{o}}_{{Cu}^{+ 2} | Cu} = 0 \cdot 337 V

and

{E^{o}}_{{Ni}^{+ 2} | Ni} = - 0 \cdot 236 V

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

The electrode potential, $E °,$ for the reduction of ${MnO}_{4}^{-}$ to ${Mn}^{2 +}$ in acidic medium is $+ 1.51$
V. Which of the following metal(s) will be oxidised? The reduction reactions and standard electrode potentials for ${Zn}^{2 +}, {Ag}^{+}$ and ${Au}^{+}$ ${Au}^{+}$ are given as

${Zn}^{2 +} (aq) + 2 e ⟶ Zn (s), E ° = - 0.762 V$

${Ag}^{+} (aq) + e ⇌ Ag (s), E ° = + 0.80 V$

${Au}^{+} (aq) + e ⇌ Au (s), E ° + 1.69 V$

HARD

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

Question Image

What do you observe at the cathode and anode respectively?

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

The order of reactivity of

K, M g, A u

and

Z n

with water is

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Four successive members of the first row of transition elements are listed below with atomic numbers. Which one of them is expected to have the highest

E_{M^{3 +} / M^{2 +}}^{o}

value?

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Among the following, which is the strongest oxidizing agent?

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

A variable, the opposite external potential

(E_{ext})

is applied to the cell

Z n | Z n^{2 +} (1 M) ∥ C u^{2 +} (1 M) | C u

, of potential

1.1 V

. When

E_{e x t} < 1.1 V

and

E_{e x t} > 1.1 V

, respectively electrons flow from

HARD

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Given below are the half - cell reactions :

\begin{matrix} {Mn}^{2 +} + 2 e^{-} \to Mn; & E^{\circ} = - 1.18 V \\ 2 ({Mn}^{3 +} + e^{-} \to {Mn}^{2 +}); & E^{\circ} = + 1.51 V \end{matrix}

The

E^{\circ}

for

3 {Mn}^{2 +} \to Mn + 2 {Mn}^{3 +}

will be :

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Consider the following standard electrode potentials (

E^{o}

in volts) in aqueous solution:

\begin{matrix} \underset{}{E l e m e n t} & \underset{}{M^{3 +} / M} & \underset{}{M^{+} / M} \\ A l & - 1.66 & + 0.55 \\ T l & + 1.26 & - 0.34 \end{matrix}

Based on these data, which of the following statements is correct?

MEDIUM

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

An iron wire is immersed in a solution containing

{ZnSO}_{4}

and

{NiSO}_{4}

. When the concentration of each salt is

1 M

, predict which of the following reaction is likely to proceed.
Given

E^{o} ({Zn}^{+ 2} / Zn) = - 0.76 V

E^{o} ({Fe}^{+ 2} / Fe) = - 0.44 V

and

E^{o} ({Ni}^{+ 2} / Ni) = - 0.25 V

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Which of the following transformations can be carried out by using

H I

as a reducing agent, under acidic conditions?

[Given :

I_{2} (s) \to 2 I^{-} E^{o} = 0.54 V

]

(i)

C u^{+} \to C u (s) E^{o} = 0.52 V

(ii)

C r^{3 +} \to C r^{2 +} E^{o} = - 0.41 V

(iii)

F e^{3 +} \to F e^{2 +} E^{o} = 0.77 V

(iv)

F e^{2 +} \to F e (s) E^{o} = - 0.44 V

EASY

Chemistry>Physical Chemistry>Redox Reactions>Redox Reactions and Electrode Processes

Which of the following metals will precipitate copper from copper sulphate solution?

The half-cell potentials for the metallic elements A, B, C and D are 0.8V, –0.74V, 1.1V and +0.34V respectively. Arrange these in the order of decreasing metallic character

Important Questions on Redox Reactions

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