Q35. E0 = +0 .34 V Cu2+ Cu E0 = −0 .76 V Zn2+ Zn Identify the incorrect statement from the options below for the above cell: (1) If Eext > 1 .1 V, e– flow from Cu to Zn (2) If Eext > 1 .1 V, Zn dissolves at Zn electrode and Cu deposits at Cu electrode (3) If Eext < 1 .1 V, Zn dissolves at anode and Cu deposits at cathode (4) If Eext = 1 .1 V, no flow of e– or current occurs
What This Question Tests
This question evaluates the comprehension of electrochemical cells, including how an external potential can reverse the spontaneity of a reaction, changing a galvanic cell into an electrolytic one.
Concepts Tested
Formulas Used
E°cell = E°cathode - E°anode
📚 NCERT Sections This Tests
2.3 — Depict The Galvanic Cell In Which The Reaction
Chemistry Class 11 · Chapter 2
2.3 Depict the galvanic cell in which the reaction Zn(s)+2Ag+(aq) ®Zn2+(aq)+2Ag(s) takes place. Further show: (i) Which of the electrode is negatively charged? (ii) The carriers of the current in the cell. (iii) Individual reaction at each electrode.
2.4 — Calculate The Standard Cell Potentials Of Galvanic Cell In Which The Following
Chemistry Class 11 · Chapter 2
2.4 Calculate the standard cell potentials of galvanic cell in which the following reactions take place: (i) 2Cr(s) + 3Cd2+(aq) ® 2Cr3+(aq) + 3Cd (ii) Fe2+(aq) + Ag+(aq) ® Fe3+(aq) + Ag(s) Calculate the DrGo and equilibrium constant of the reactions. 2.5 Write the Nernst equation and emf of the following cells at 298 K: (i) Mg(s)|Mg2+(0.001M)||Cu2+(0.0001 M)|Cu(s) (ii) Fe(s)|Fe2+(0.001M)||H+(1M)|H2(g)(1bar)| Pt(s) (iii) Sn(s)|Sn2+(0.050 M)||H+(0.020 M)|H2(g) (1 bar)|Pt(s) (iv) Pt(s)|Br–(0.010 M)|Br2(l )||H+(0.030 M)| H2(g) (1 bar)|Pt(s).
2.2 — Given The Standard Electrode Potentials,
Chemistry Class 11 · Chapter 2
2.2 Given the standard electrode potentials, K+/K = –2.93V, Ag+/Ag = 0.80V, Hg2+/Hg = 0.79V Mg2+/Mg = –2.37 V, Cr3+/Cr = – 0.74V Arrange these metals in their increasing order of reducing power.
📋 Question Details
- Chapter
- Electrochemistry
- Topic
- Electrochemical Cells
- Year
- 2020
- Shift
- 04 Sep Shift 1
- Q Number
- Q35
- Type
- MCQ
- NCERT Ref
- Class 12 Chemistry Ch 3: Electrochemistry
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