SATHEE: Redox Reactions And Electrochemistry Ques 601

Redox Reactions And Electrochemistry Ques 601

Question: What is the e.m.f for the given cell-

$C r | C r^{3 +} (1.0 M) | | C o^{2 +} (1.0 M) | C o$ $(E^{\circ} f o r C r^{3 +} / C r = - 0.74$ volt and $E^{\circ}$ for $C o^{2 +} / C o = - 0.28$ volt)

Options:

A) $- 0.46$ volt

B) $- 1.02, v o l t$

C) $+ 0.46$ volt

D) 1.66 volt

Show Answer

Answer:

Correct Answer: C

Solution:

[c] $E_{C r^{3 +} / C r}^{^{\circ}} = - 0.74 V,, E_{C o^{2 +} / C o}^{^{\circ}} = - 0.28 V$ The given cell reaction is $C r | C r^{3 +} (1.0 M) | | C o^{2 +} (1.0 M) | C o$
$∴ C r$ is anode and Co is cathode $E_{c e l l}^{^{\circ}} = E_{C}^{^{\circ}} - E_{A}^{^{\circ}} = - 0.28 - (- 0.74)$ $= - 0.28 + 0.74 = + 0.46 V$

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Redox Reactions And Electrochemistry Ques 601

Question: What is the e.m.f for the given cell-

Options:

Answer:

Solution:

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