Electrochemistry questions
1808 published questions with worked solutions.
- The position of some metals in the electrochemical series in decreasing electropositive character is Mg > Al > Zn > Cu > Ag ....
- KCl (aq) cannot be used as a salt bridge for the cell Cu (s) ,| , CuSO_4 (aq) ,|| , AgNO_3 (aq) ,| , Ag (s) because
- A current of i ampere was passed for t second through three cells P, Q and R connected in series, containing respectively silver...
- In electrochemical corrosion of metals, the metal undergoing corrosion
- Given (i) Cu^ 2+ +2e^- Cu , E^ =0.337 V and (ii) Cu^ 2+ +e^- Cu^+ , E^ =0.153 V, the electrode potential E^ for the reaction Cu^+...
- A hydrogen electrode placed in a buffer solution of CH_3COONa and acetic acid in the ratios x:y and y:x has (oxidation potential)...
- The correct value of e.m.f. of a cell is given by (i) E_ cell =E_ OP,anode -E_ RP,cathode , (ii) E_ cell =E_ OP,anode +E_...
- The same amount of electricity was passed through two separate electrolytic cells containing solutions of nickel nitrate and...
- In a concentration cell
- The standard oxidation potentials, E^ , for the half reactions are: Zn Zn^ 2+ +2e^-, E^ =+0.76 V; Ag Ag^+ +e^-, E^ =-0.77 V. The...
- In concentration cells, the electrical energy is produced due to
- 1 faraday of electricity will liberate 1 g-atom of the metal from a solution of
- The approximate e.m.f. of a dry cell is
- Standard E^ of the half cell Fe|Fe^ 2+ is +0.44 V and standard E^ of half cell Cu|Cu^ 2+ is -0.32 V (both as oxidation...
- 1 mole of Al is deposited by X coulomb of electricity passing through aluminium nitrate solution. The number of moles of silver...
- The cell reaction Zn + Cu^ 2+ Zn^ 2+ + Cu is best represented by
- A correct electrochemical series can be obtained from K, Ca, Na, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
- The calomel electrode is reversible with respect to
- The standard electrode potential for the change Sn (s)+2 Fe^ 3+ (aq) 2 Fe^ 2+ (aq)+ Sn^ 2+ (aq) is (given E^ _ Fe^ 3+ /Fe^ 2+...
- A cell in which electric current is produced by net oxidation and reduction processes (and which converts chemical energy to...
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