A hydrogen gas electrode is made by dipping platinum wire in a solution of HCI of pH = 10 and by passing hydrogen gas around the platinum wire at 1 atm pressure. The oxidation potential of electrode would be

(a) 0.059 V

(b) 0.59 V

(c) 00.118 V

(d) 1.18 V

 

Concept Questions :-

Electrode Potential / Introduction
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The atomic mass of Al is 27. When a current of 5 faraday is passed through a solution of Al3+ ions, the mass of Al deposited is:

(a) 27g

(b) 36g

(c) 45g

(d) 9g

Concept Questions :-

Faraday’s Law of Electrolysis
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Cu+(aq) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction 

2Cu+(aq) Cu2+(aq) + Cu(s)

Choose the correct E0 for above reaction if E0cu2+/cu = 0.34 V and E0cu2+/cu+ = 0.15 V 

(a) -0.38 V

(b) +4.9 V

(C) +0.38 V

(d) -0.19 V

Concept Questions :-

Relation between Cell Potential and Gibbs Energy and Kc/pH
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On the basis of the information available from the reaction.

43Al + O2           23Al2O3, G =-827kJ mol-1 

of O2, the minimum EMF required to carry out the electrolysis of Al2O3 is (F=96500 C mol-1

(a) 2.14 V

(b) 4.28 V

(c) 6.42 V

(d) 8.56 V

Concept Questions :-

Faraday’s Law of Electrolysis
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4.5 g of aluminium (atomic mass 27u) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be

(a) 44.8 L

(b) 22.4 L

(c) 11.2 L

(d) 5.6 L

Concept Questions :-

Faraday’s Law of Electrolysis
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Which one of the following pairs of substances on reaction will not evolve H2 gas?

(a) Iron and H2SO4 (aq)

(b) iron and steam

(c) Copper and HCl(aq)

(d) Sodium and ethyl alcohol

Concept Questions :-

Electrochemical series
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A certain current liberates 0.504 g of hydrogen in 2 hr. How many gram of copper can be liberated by the same current flowing for the same time in CuSO4 solution?

(a) 12.7

(b) 16

(c) 31.8

(d) 63.5

Concept Questions :-

Faraday’s Law of Electrolysis
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For the reductidon of silver ions with copper metal, the standard  cell potential was found to be + 0.46 V at 250C. The value of standard Gibbs energy, -Gwill be (F = 96500 Cmol-1)

(a) -89.0 KJ

(b) -89.0 J

(c) -44.5 KJ

(d) -98.0 KJ

Concept Questions :-

Relation between Cell Potential and Gibbs Energy and Kc/pH
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A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively:

(a) H2, O2

(b) O2, H2

(c) O2, Na

(d) O2, SO2

Concept Questions :-

Electrolytic Cell/ Electrochemical Cell/Galvanic Cell
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If a salt bridge is removed from the two half cells, the voltage:

(a) drops to zero

(b) does not change

(c) increases gradually

(d) increases rapidly

Concept Questions :-

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