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Redox Reactions and Couple

For the galva...

Question

For the galvanic cell, $C u | C u^{2 +} | | A g^{+} | A g$ . Which of the following observations is not correct?

A

Cu acts as anode and Ag acts as cathode

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B

Ag electrode loses mass and Cu electrode gains mass

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C

Reaction at anode,

C u \to C u^{2 +} + 2 e^{-}

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D

Copper is more reactive than silver

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Solution

The correct option is C Ag electrode loses mass and Cu electrode gains mass
Redox reactions are reactions in which both oxidation and reduction takes place together. In a Galvanic cell oxidation occurs at anode and reduction occurs at cathode. Here $C u$ is an anode and $A g$ is a cathode. As in Oxidation, the electrons get released to form aqueous ions in the solution and hence reduces the mass of the electrode as the electrons are released from the electrode. Here, $C u$ electrode loses mass. Similarly,the released electrons are gained by silver ions i.e $A g^{+}$ and the electrode mass of $A g$ gets increased. Hence, B is the wrong option.

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Similar questions

Q. Which of the following represents the anode half-cell reaction for the following galvanic cell:

C u (s) | C u^{2 +} (a q) | | A g^{+} (a q) | A g (s)

C u^{2 +} + 2 e^{-} ⟶ C u

E^{0} = 0.337 V

C u^{2 +} + e^{-} ⟶ C u^{+}

E^{0} = 0.153 V

Electrode potential,

E^{0}

for the reaction

C u^{+} + e^{-} ⟶ C u

Q. The standard reduction potentials of

C u^{2 +} | C u

A g^{+} | A g

0.337

0.799 v o l t s

respectively. Construct a galvanic cell using these electrodes so that its standard emf is positive. For what concentration of

A g^{+}

will the emf of the cell at

25^{\circ} C

be zero if concentration of

C u^{2 +}

0.01 M

Z n ∣ ∣ ∣ \begin{matrix} Z n (N O_{3})_{2} (a q) 100 m L, 1 M \end{matrix} ∣ ∣ ∣ ∣ ∣ ∣ \begin{matrix} C u (N O_{3})_{2} (a q) 100 m L, 1 M \end{matrix} ∣ ∣ ∣ C u

The following galvanic cell was operated as an electrolytic cell using Cu as anode and Zn as cathode. A current of 0.48 ampere was passed for 10 hour and then the cell was allowed to function as galvanic cell. The e.m.f. of the cell at 25

^{o}

C is (write the nearest integer value) :
Assume that the only electrode reactions occurring were those involving

C u / c u^{2 +}

Z n / Z n^{2 +}

E_{C u^{2 +}, C u}^{o} = 0.34 V

E_{Z n, Z n^{2 +}}^{o} = - 0.76 V

Q. The standard electrode potentials of

C u^{2 +} | C u^{+}

C u^{+} | C u

electrodes are +0.18V and +0.50V. The potential of

C u^{2 +} | C u

electrode is _________.

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