Electrochemistry questions
1808 published questions with worked solutions.
- During the electrolysis of fused sodium chloride, the reactions at the electrodes are
- An electrolytic cell contains a solution of Ag_2SO_4 and platinum electrodes. Current is passed until 1.6 g of O_2 has been...
- A student made the following observations: (i) clean copper metal did not react with 1 M Pb(NO_3)_2 solution; (ii) clean lead...
- In a cell containing a zinc electrode and a standard hydrogen electrode (SHE), the zinc electrode acts as
- The standard reduction potentials for the following half-reactions are: (i) Zn^ 2+ +2e^- Zn (s), E^ =-0.762 V; (ii) Cr^ 3+ +3e^-...
- The reaction taking place at the anode when an aqueous solution of CuSO_4 is electrolysed using an inert Pt electrode is
- A normal Al- AlCl_3 electrode coupled with a normal hydrogen electrode gives an emf of 1.66 V. The standard oxidation electrode...
- Which is the correct representation for a cell at equilibrium?
- Lithium is generally used as an electrode in high-energy-density batteries. This is because
- At pH =2, E^ _ quinhydrone =1.30 V. E_ quinhydrone will be
- 4.5 g of Al (atomic mass 27 amu) is deposited at the cathode from an Al^ 3+ solution by a certain quantity of charge. The volume...
- In electrolysis, oxidation takes place at
- E^ for OCl^-/Cl^- is 0.94 V and for Cl^- / 12 Cl_2 is -1.36 V (oxidation). E^ for OCl^- / 12 Cl_2 is
- For which cell is the emf independent of the concentration of the electrolytes used?
- The e.m.f. of the cell involving the change Zn (s)+ Ni^ 2+ (1 ,M) Zn^ 2+ (1 ,M)+ Ni (s) is 0.5105 V. The standard e.m.f. of the...
- Passage of 1 faraday of electricity through a solution of CuSO_4 deposits
- If the half-cell reaction A+e^- A^- has a large negative reduction potential, it follows that
- The e.m.f. of the cell Zn ,| ,Zn^ 2+ (1 ,M) ,|| , Cu^ 2+ ,| ,Cu (1 ,M) is 1.1 volt. If the standard reduction potential of Zn^ 2+...
- How many faraday are needed to reduce a mole of MnO_4^- to Mn^ 2+ ?
- For I_2 +2e^- 2 I^- , standard reduction potential =+0.54 V. For 2 Br^- Br_2 +2e^-, standard oxidation potential =-1.09 V. For Fe...
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