The volume of gases liberated at STP when a charge of 2F is passed through aqueous solution of sodium phosphate, is :

1. 11.2L                                           

2. 44.8L

3. 33.6L                                           

4. 22.4L

Subtopic:  Faraday’s Law of Electrolysis |
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It is desired to convert the energy derived from the combustion of propane into electrical energy, via a fuel cell. Given that the standard free energies of formation of C3H8 (g), H2O(l) and CO2 (g) are -23.5, -237.2 and -394.4 kJ mol-1 respectively, calculate the standard EMF of the propane fuel cell.

(1) 1.10 V                                           

(2) 2.10V

(3) 3.12 V                                           

(4) 4.12 V

Subtopic:  Relation between Emf, G, Kc & pH |
 52%
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The temperature coefficient of a standard Cd-cell is 5.0 × 10-5 Vk-1 whose emf at 25°C is 1.018 V. During the cell operation, the temperature will -

(1) increase                                      

(2) decreases

(3) either                                         

(4) remains constant

Subtopic:  Relation between Emf, G, Kc & pH |
 63%
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Na-amalgam is prepared by electrolysis of NaCl solution using liquid Hg as a cathode. How

long should the current of 10 amp. is passed to produce 10% Na – Hg on a cathode of 10

gm Hg. (atomic mass of Na = 23).

(A) 7.77 min.                                               

(B) 9.44 min.

(C) 5.24 min.                                               

(D) 11.39 min.

Subtopic:  Faraday’s Law of Electrolysis |
 59%
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The standard reduction potential of a silver chloride electrode is 0.2 V and that of a silver electrode is 0.79 V. The maximum amount of AgCl that can dissolve in 106 L of a 0.1 M AgNO3 solution is 

(1) 0.5 mmol                                              

(2) 1.0 mmol

(2) 2.0 mmol                                             

(4) 2.5 mmol

Subtopic:  Relation between Emf, G, Kc & pH |
 65%
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The k= 4.95 × 10-5S cm-1 for a 0.00099 M solution. The reciprocal of the degree of dissociation of acetic acid, if m0 for acetic acid is 400 S cm2mol-1 will be:

1. 7 2. 8
3. 9 4. 10
Subtopic:  Conductance & Conductivity |
 82%
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Pure water is saturated with pure solid AgCl, a silver electrode is placed in the solution and the potential is measured against normal calomel electrode at 25°C. This experiment is then repeated with a saturated solution of AgI. If the difference in potential in the two cases is 0.177 V. What is the ratio of solubilities of AgCl and AgI at the temperature of the experiment ?

(1) 103   

(2) 106 

(3) 104 

(4) 102

Subtopic:  Relation between Emf, G, Kc & pH |
 51%
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A hydrogen electrode X was placed in a buffer solution of sodium acetate and acetic acid in the ratio a : b and another hydrogen electrode Y was placed in a buffer solution of sodium acetate and acetic acid in the ratio b : a. If reduction potential values for two cells are found to be E1and E2 respectively with respect to standard hydrogen electrode, the pKa value of the acid can be given as

(1) E1-E20.118                                           

(2) E1+E20.118

(3) E1E2×0.118                                      

(4) E2-E10.118

Subtopic:  Relation between Emf, G, Kc & pH |
 55%
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Calculate the useful work of the reaction \(Ag(s) + {1 \over 2} Cl_2(g) \rightarrow AgCl(s)\) 

Given,
E°Cl2/Cl-=+1.36 V, E°AgCl/Ag,Cl-=0.22 V
If PCl2=1 atm and T=298 K

(1) 110 kJ/mol

(2) 220 kJ/mol

(3) 55 kJ/mol

(4) 1000 kJ/mol

Subtopic:  Relation between Emf, G, Kc & pH |
 69%
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A resistance of 50Ω is registered when two electrodes are suspended into a beaker containing a dilute solution of a strong electrolyte such that exactly half of the them are submerged into solution. If the solution is diluted by adding pure water (negligible conductivity) so as to just completely submerge the electrodes, the new resistance offered by the solution would be

                                          

(1) 50Ω                                       

(2) 100 Ω

(3) 25Ω                                       

(4) 200Ω




Subtopic:  Conductance & Conductivity |
 54%
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