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During electrolysis of CuSO₄(aq) using platinum electrodes, the pH of solution (electrolyte)

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Important Questions on Redox Reactions

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

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

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

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

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

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

EASY

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

Hypophosphorus acid is a good reducing agent because

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.

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

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

What do you observe at the cathode and anode respectively?

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

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

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

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

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

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

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

Using the standard electrode potentials given below, calculate the

E^{0}

cell for Fe³⁺(aq) and Cu(s)

(\begin{matrix} E_{{Fe}^{3 +} / {Fe}^{2 +}}^{\circ} = 0.77 V, & E_{{Cu}^{2 +} / Cu}^{\circ} = 0.34 V \end{matrix})

MEDIUM

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

E_{Cu}^{°} = 0 .34 V

and

E_{Zn}^{°} = 0 .76 V .

A Daniel cell contains

0.1 M Z n S O_{4}

solution and

0.01 M C u S O_{4}

solution at its electrodes. EMF of the cell is

HARD

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

Aqueous ${Cu}^{+}$ is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction

$2 {Cu}^{+} (aq) ⇌ {Cu}^{2 +} (aq) + Cu (s)$ .

Choose the correct $E^{°}$ for the above reaction.

EASY

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

The standard electrode potential of hydrogen electrode at 1 M concentration and hydrogen gas at 1atm pressure is

EASY

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

The strongest reducing agent among the following is

During electrolysis of CuSO4(aq) using platinum electrodes, the pH of solution (electrolyte)

Important Questions on Redox Reactions

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During electrolysis of CuSO₄(aq) using platinum electrodes, the pH of solution (electrolyte)