SATHEE: Redox Reactions And Electrochemistry Ques 221

Redox Reactions And Electrochemistry Ques 221

Question: Aluminium displaces hydrogen from dilute HCl whereas silver does not. The e.m.f. of a cell prepared by combining $A l / A l^{3 +}$ and $A g / A g^{+}$ is 2.46 V. The reduction potential of silver electrode is $+ 0.80 V$ . The reduction potential of aluminium electrode is [KCET 2004]

Options:

A) $+ 1.66 V$

B) $- 3.26, V$

C) $3.26 V$

D) $- 1.66 V$

Show Answer

Answer:

Correct Answer: D

Solution:

Al displaces H from HCl but silver cannot it means Al is situated above the Ag in ECS, hence Al will acts as anode and Ag will act as cathode.

$E_{c e l l}^{0} = E_{C a t h o d e}^{0} - E_{A n o d e}^{0}$

$= E_{A g^{+} / A g}^{0} - E_{A l^{3 +} / A l}^{0}$ $2.46 = 0.8 - E_{A l^{3 +} / A l}^{0}$ ; $E_{A} l^{0} = 0.8 - 2.46 = - 1.66 V$ .

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Redox Reactions And Electrochemistry Ques 221

Question: Aluminium displaces hydrogen from dilute HCl whereas silver does not. The e.m.f. of a cell prepared by combining Al/Al3+ and Ag/Ag+ is 2.46 V. The reduction potential of silver electrode is +0.80 V . The reduction potential of aluminium electrode is [KCET 2004]

Options:

Answer:

Solution:

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Question: Aluminium displaces hydrogen from dilute HCl whereas silver does not. The e.m.f. of a cell prepared by combining $A l / A l^{3 +}$ and $A g / A g^{+}$ is 2.46 V. The reduction potential of silver electrode is $+ 0.80 V$ . The reduction potential of aluminium electrode is [KCET 2004]