A cell is represented by Zn|Zn2+ (aq) || Cu2+ (aq)| Cu. Given, Cu2+ + 2e- → Zn, E° = -0.763 V. Write the cell reactions, emf of the cell and state whether the cell reaction will be spontaneous or not?
Cadmium rods are used for which purpese?
Emit electrons
Absorb neutrons
Emit neutrons
Absorb electrons
What is the effect of dilution on the equivalent conductance of strong electrolyte?
Decrease on dilution
Remains unchanged
Increase on dilution
None of the above
In Down's method for the extraction of sodium, the melting point of the electrolyte is lowered by adding
potassium chloride
calcium chloride
both calcium chloride and potassium fluoride
potassium fluoride only
Calcium is obtained by
electrolysis of molten CaCl2
electrolysis of solution of CaCl2 in water
reduction of CaCl2 with carbon
roasting of lime stone
A current of 12 ampere is passed through an electrolytic cell containing aqueous NiSO4 solution. Both Ni and H2 gas are formed at the cathode. The current efficiency is 60%. What is the mass of nickel deposited on the cathode per hour?
7.883g
3.941g
5.91g
2.645g
The cell reaction of a cell is If the standard reduction potentials of Mg and Cu are - 2.37 and + 0.34V respectively. The emf of the cell is
2.03V
-2.03V
+2.71V
-2.71V
In the electrochemical reaction, increasing the concentration of Fe2+
increases cell emf
increases the current flow
decrease the cell emf
alter the pH of the solution