Is it safe to stir 1 M AgNO 3 solution with a copper spoon? Given: E ∘ Ag + , Ag = 0 .80 volt and E ∘ Cu , Cu 2 + = – 0 .34 volt . Explain.

Since, E ° Ag + , Ag = + 0 .80 V is higher than E ° Cu 2 + , Cu = - E ° Cu 2 + , Cu = - - 0 .34 = + 0 .34 V Therefore, Ag + ions can easily accept electrons from Cu . In other words, the following reaction will occur. Cu + 2 Ag + → Cu 2 + + 2 Ag Hence, 1 M AgNO 3 , solution cannot be stirred with a copper spoon.

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The negative sign in the standard electrode potential indicates-

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Important Questions on Redox Reactions

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 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

)

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?

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

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

What do you observe at the cathode and anode respectively?

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?

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

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

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

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

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

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

The order of reactivity of

K, M g, A u

and

Z n

with water is

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?

EASY

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

Why blue colour of copper sulphate solution gets discharged when zinc rod is dipped in it? Given:

{E^{\circ}}_{{Cu}^{2 +} / Cu} = 0 .34 V

and

{E^{\circ}}_{Zn / {Zn}^{2 +}} = 0 .76 V

EASY

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

Following cell is set up between copper and silver electrodes :

Cu | {Cu}^{2 +} (aq) ‖ {Ag}^{+} (aq) | Ag

If its two half cells work under standard conditions, calculate the e.m.f. of the cell

[Given E_{{Cu}^{2 +} / Cu}^{°} = + 0 .34 volt, E_{{Ag}^{+} / Ag}^{°} = + 0 .80 volt]

EASY

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

Predict reaction of

1 N

sulphuric acid with the following metals: (i) Copper (ii) lead (iii) iron
Given :

{E^{\circ}}_{{Cu}^{2 +}, Cu}

= + 0.34 volt

;

{E^{\circ}}_{{Pb}^{2 +}, Pb}

= - 0.13 volt

;

{E^{\circ}}_{{Fe}^{2 +}, Fe}

= - 0.44 volt

EASY

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

Is it safe to stir

1 M

{AgNO}_{3}

solution with a copper spoon? Given:

{E^{\circ}}_{{Ag}^{+}, Ag} = 0 .80 volt

and

{E^{\circ}}_{Cu, {Cu}^{2 +}} = - 0 .34 volt .

Explain.

EASY

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

If ϕ denotes reduction potential, then which is true?

MEDIUM

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

The e.m.f.

(E °)

of the following cells are

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

E = - 0.46 V

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

E = + 1.10 V

Calculate the e.m.f. of the cell

Zn | {Zn}^{2 +} (1 M) ‖ {Ag}^{+} (1 M) | Ag

The negative sign in the standard electrode potential indicates-

Important Questions on Redox Reactions

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