The potential of a hydrogen electrode at pH = 10 is 

• 0.59 V

• 0.00 V

• -0.59 V

• - 0.059 

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

408.

The cell reaction of a cell is $\mathrm{Mg}\left(\mathrm{s}\right) + {\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right) \to \mathrm{Cu}\left(\mathrm{s}\right) + {\mathrm{Mg}}^{2+}\left(\mathrm{aq}\right).$ 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, $2{\mathrm{Fe}}^{3+}+ \mathrm{Zn} \to {\mathrm{Zn}}^{2+}+ 2{\mathrm{Fe}}^{2+}$ increasing the concentration of Fe²⁺

• increases cell emf

• increases the current flow

• decrease the cell emf

• alter the pH of the solution

Distribution law was given by :

• Henry

• vant Hoff

• Nernst

• Ostwald