# In the electrochemical cell:    the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 is changed to 0.01 M, the emf changes to E2. From the following, which one is the relationship between E1 and E2 ?  (Given, $$\frac{RT}{F}$$ = 0.059) 1. ${E}_{1}<{E}_{2}$ 2. ${E}_{1}>{E}_{2}$ 3. ${E}_{2}=0\ne {E}_{1}$ 4. ${E}_{1}={E}_{2}$

Subtopic:  Electrode & Electrode Potential | Nernst Equation |
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If the Eocell for a given reaction has a negative value, which of the following gives correct relationships for the values of  ∆Go and Keq?

1.

2.

3.

4.

Subtopic:  Relation between Emf, G, Kc & pH |
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The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is :

(Charge on electron = 1.60x 10-19 C)

1.  $6×{10}^{23}$

2.  $6×{10}^{20}$

3.  $3.75×{10}^{20}$

4.  $7.48×{10}^{20}$

Subtopic:  Faraday’s Law of Electrolysis |
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Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below:

Then the species undergoing disproportionation is:-

1.

2.

3.

4. HBrO

Subtopic:  Electrode & Electrode Potential |
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The pressure of H2 required to make the potential of H- electrode zero in pure water at 298 K is

1. 10-12  atm
2. 10-10  atm
3. 10-4  atm
4. 10-14 atm

Subtopic:  Nernst Equation |
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A device that converts energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as :

1. Fuel cell
2. Electrolytic cell
3. Dynamo
4. Ni-Cd cell

Subtopic:  Batteries & Salt Bridge |
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When 0.1 mol MnO42- is oxidized the quantity of electricity required to completely oxidise MnO42--  to MnO4- is :

1. 96500 C

2. 2 x 96500 C

3. 9650 C

4. 96.50 C

Subtopic:  Faraday’s Law of Electrolysis |
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The weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of Oat STP will be :

1. 5.4 g

2. 10.8 g

3. 54.0 g

4. 108.0 g

Subtopic:  Faraday’s Law of Electrolysis |
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A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be :

1. 0.59 V
2. 0.118 V
3. 1.18 V
4. 0.059 V

Subtopic:  Relation between Emf, G, Kc & pH |
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At 25 ºC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm–1cm2 mol–1 and at infinite dilution, its molar conductance is 238 ohm–1 cm2 mol–1. The degree of ionization of ammonium hydroxide at the same concentration and temperature is :

1. 20.800%

2. 4.008%

3. 40.800%

4. 2.080%
Subtopic:   Kohlrausch Law & Cell Constant |
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