Q.

Consider the galvanic cell reaction,Zn(s)+2Ag+(aq)⟶Zn2+(aq)+2Ag(s)Which of the following statements are correct?

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a

Zinc electrode is negatively charged

b

The ions carry current in the cell

c

At anode, Zn⟶Zn2++2e-

d

At cathode, Ag+(aq)+e-⟶Ag(s)

answer is A.

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Detailed Solution

The given redox reaction for the galvanic cell isZn(s)+2Ag+(aq)⟶Zn2+(aq)+2Ag(s)At anode Zn is oxidised to Zn2+ions and at cathodeAg+ ions are reduced to Ag metal. Thus, galvanic cell for the above redox reaction may be depicted as ZnZn2+(aq)‖Ag+(aq)Ag(i) Zn electrode is negatively charged because of the oxidation of Zn to Zn2+ions, electrons are accumulated on zinc electrode.(ii) The ions carry current in the cell. Current flows from Ag electrode to Zn electrode, while electrons flow from Zn electrode to Ag electrode.(iii) Individual reaction at each electrode Anode Zn(s)⟶Zn2+(aq)+2e- Cathode Ag+(aq)+e-⟶Ag(s)
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