The solubility product of silver iodide is 8.3 × 10-17and the standard potential (reduction) of Ag,Ag+ electrode is + 0.800 volts at  25°C.The standard potential of Ag, AgI/I- electrode (reduction) from these data is-

(A) – 0.30 V                            

(B) + 0.15 V

(C) + 0.10 V                            

(D) – 0.15 V

Concept Questions :-

Relation between Cell Potential and Gibbs Energy and Kc/pH
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How much time is required for the complete decomposition of 2 moles of water using a current of 2 ampere-

(A) 26.805 h                                   

(B) 53.61 h

(C) 107.22 h                                   

(D) None of these

Concept Questions :-

Faraday’s Law of Electrolysis
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The standard redox potentials E of the following systems are-

System                                                                                    E° (volts)

(i) MnO4-+ 8H+ + 5e Mn2+ + 4H2O                     1.51

(ii) Sn4++ 2e  Sn2+                                                         0.15       

(iii) Cr2O72-+ 14H+ + 6e 2Cr3+ + 7H2O             1.33

(iv) Ce4+ + e  Ce3+                                                       1.61

The oxidising power of the various species decreases in the order-

(A) Ce4+>Cr2O72-> Sn4+ > MnO4-

(B) Ce4+>MnO4- >Cr2O72-> Sn4+

(C) Cr2O72->Sn4+>Ce4++ MnO4-

(D) MnO4->Ce4+ > Sn4+>Cr2O72-

Concept Questions :-

Electrode Potential / Introduction
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A certain current liberates 0.504 g of hydrogen in 2 hours. How many gram of copper can be liberated by the same current flowing for the same time in aqueous CuSO4 solution :

(A) 12.7                                                             

(B) 16

(C) 31.8                                                             

(D) 63.5

Concept Questions :-

Faraday’s Law of Electrolysis
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Calculate the maximum work that can be obtained from the Daniell cell given below -

Zn(s) | Zn2+ (aq) || Cu2+ (aq) | Cu(s).

Given that EZn2+/Zn°=-0.76 V and ECu2+/Cu°=+0.34 V

(A) – 212300 J                                        

(B) – 202100 J

(C) – 513100 J                                        

(D) – 232120 J

 

Concept Questions :-

Relation between Cell Potential and Gibbs Energy and Kc/pH
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The metal that cannot be produced on reduction of its oxide by aluminium is :

(A) K                                                        

(B) Mn

(C) Cr                                                      

(D) Fe

Concept Questions :-

Electrode Potential / Introduction
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We have taken a saturated solution of AgBr, Ksp of AgBr is 12 × 10-14. If 10-7mole of AgNO3 are added to 1 litre of this solution then the conductivity of this solution in terms of 10-7 Sm-1 units will be

[λ°Ag+=4×10-3Sm2mol-1 ;λ°Br-=6×10-3Sm2mol-1,λ°NO3-=5×10-3Sm2mol-1]

(A) 39                                                                   

(B) 55

(C) 15                                                                   

(D) 41

Concept Questions :-

Electrode Potential / Introduction
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The standard reduction potentials, E, for the half reactions are as Zn = Zn2++ 2e; E° = + 0.76 Vand Fe = Fe2+ + 2e ; E° = + 0.41 V; the e.m.f. for the cell reaction, Fe2++ Zn = Zn2++ Fe  is-

(A) – 0.35 V                                            

(B) + 0.35 V

(C) + 1.17 V                                           

(D) – 1.17 V

Concept Questions :-

Electrode Potential / Introduction
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Which of following cell can produce more electrical work.

(A) pt, H2 | NH4Cl || 0.1 M CH3COOH | H2 , pt

(B) pt, H2 | 0.1 M HCl || 0.1 M NaOH | H2 , pt

(C) pt, H2 | 0.1 M HCl || 0.1 M CH3COOK | H2 , pt

(D) pt, H2 | 0.1 M CH3COOK || 0.1 M HCl | H2 , pt

Concept Questions :-

Nernst Equation
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The calomel electrode is reversible with respect to-

(A) Mercury                                       

(B) H+

(C) Hg2+                                          

(D) Cl-

Concept Questions :-

Active and inert Electrodes
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