Use the References to access important values if needed for this question. A sta

Question

Use the References to access important values if needed for this question. A standard galvanic cell is constructed with g and CrCr half cell compartments connected by a salt bridge. Which of the following statements are correct? Hint: Refer to a table of standard reduction potentials. (Choose all that apply.) The cathode compartment is the Hg2+Hg compartment. Hg is oxidized at the anode The anode compartment is the Hg2'Hg compartment. As the cell runs, anions will migrate from the Cr3+Cr compartment to the Hg2+Hg compartment. In the external circuit, electrons flow from the Cr3 Cr compartment to the Hg2+Hg compartment. to the Hg2 THg compartment. Hg2 Hg compartment. Submit Answer Retry Entire Group 8 more group attempts remalning

Explanation / Answer

Standard electrode potentials (E0)

Hg2+ /Hg= 0.79V   Cr3+/Cr = -0.74V

Hg2+ /Hg half cell has higher standard electrode potential than Cr3+/Cr. Hence Hg2+ /Hg is the cathode compartment and Cr3+/Cr is the anode compartment.

3Hg2+(aq) + 2Cr (s)---------> 3Hg(s) + 2 Cr3+ (aq)

At Cathode: Hg2+ + 2e----------> Hg    (Reduction)

At Anode :   2Cr ---------> Cr3++ 3e- (Oxidation)

Hg2+ /Hg is the cathode compartment ( 1st option is correct)

No Hg present at anode (2nd option is wrong)

anode compartment is Cr3+/Cr (3rd option is wrong)

Anion will migrate from cathode to anode to neutralize the positive charge developed due to oxidation.

(4th option is wrong)

In the external circuit, electrons flow from the anode to the cathode from which reduction takes place at cathode.( 5th option is correct)

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