E₁, E₂, E₃ are the emf values of the three galvanic cells respectively.

$$\begin{gathered} \left(\mathrm{i}\right)\hspace{0.17em}\mathrm{Zn}| {\mathrm{Zn}}_{1\mathrm{M}}^{2+}|| {\mathrm{Cu}}_{0.1\mathrm{M}}^{2+}|\mathrm{Cu} \\ \left(\mathrm{ii}\right)\hspace{0.17em}\mathrm{Zn}| {\mathrm{Zn}}_{1\mathrm{M}}^{2+}|| {\mathrm{Cu}}_{1\mathrm{M}}^{2+}|\mathrm{Cu} \\ \left(\mathrm{iii}\right)\mathrm{Zn}| {\mathrm{Zn}}_{0.1\mathrm{M}}^{2+}|| {\mathrm{Cu}}_{1\mathrm{M}}^{2+}|\mathrm{Cu} \end{gathered}$$

Which one of the following is true?

• E₁> E₂ >E₃

•  E₂ >E₃ >E₁

• E₃ >E₂ > E₁

• E₁> E₃ >E₂

Which one of the following has a potential more than zero?

• Pt, $\frac{1}{2}$H₂ (1 atm) | HCl (2M)

• Pt, $\frac{1}{2}$H₂ (1 atm) | HCl (0.1 M)

• Pt, $\frac{1}{2}$H₂ (1 atm) | HCl (0.5 M)

• Pt, $\frac{1}{2}$ H₂ (1 atm) | HCl (1M)

100 mL of 0.1 M acetic acid is completely neutralized using a standard solution of NaOH. The volume of ethane obtained at STP after the complete electrolysis of the resulting solution is

• 56 mL

• 224 mL

• 560 mL

• 112 mL

The emf of a galvanic cell constituted with the electrode Zn²⁺|Zn (-0.76V) and Fe²⁺|Fe (-0.41V) is

• -0.35V

• + 1.17V

• +0.35V

• -1.17V

For hydrogen-oxygen fuel cell at 1 atm and 298 K

H₂ (g) + $\frac{1}{2}$O₂ (g) → H₂O (l) ; $∆$G° = -240 kJ

E° for the cell is approximately, (Given F = 96500 C)

• 2.48 V

• 1.25 V

• 2.5 V

• 1.26 V

While charging the lead storage battery,

• PbSO₄ on anode is reduced to Pb

• PbSO₄ on cathode is reduced to Pb

• PbSO₄ on cathode is oxidised to Pb

• PbSO₄ on anode is oxidised to PbO₂

In H₂-O₂ fuel cell the reaction occurring at cathode is

• 2H₂ (g) + O₂ → 2H₂O(l)

• O₂(g) + 2H₂O(l) + 4e^- → 4OH^-(aq)

• H⁺ +e^- → 1/2H₂

• H⁺(aq) + OH^- → H₂O(l)

Which of the following is incorrect in a galvanic cell?

• Oxidation occurs at anode

• Reduction occurs at cathode

• The electrode at which electrons are gained is called cathode

• The electrode at which electrons are lost is called cathode

209.

A secondary cell is one

• can be recharged

• can be recharged by passing current through it in the same direction

• can be recharged by passing current through it in the opposite direction

• cannot be recharged

The amount of current in Faraday, is required for the reduction of 1 mole of Cr₂O${}_7^{2-}$ ions to Cr³⁺ is

• 1 F

• 2 F

• 6 F

• 4 F