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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In the electrochemical cell:

Zn|ZnSO4(0.01 M) || CuSO4(1.0M),Cu, 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. The relationship between E1 and E2 is : 
( Given, RT= 0.059)

1. E1 = E2

2. E1 < E2

3. E1 > E2

4. E2 = 0 ≠ E1

Subtopic:  Electrode & Electrode Potential | Nernst Equation |
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The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76x10-3 S cm-1 at 298 K is

(1) 2.88 S cm2/mol

(2) 11.52 S cm2/mol

(3) 0.086 S cm2/mol

(4) 28.8 S cm2/mol

 

Subtopic:  Conductance & Conductivity |
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During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is

(1) 55 minutes                       

(2) 110 minutes

(3) 220 minutes                       

(4) 330 minutes

Subtopic:  Faraday’s Law of Electrolysis |
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If the E°cell for a given reaction has a negative value, which of the following gives correct relationships for the values of G° and Keq ?

(1) G° >0;  Keq< 1

(2) G° >0; Keq>1

(3) G° < 0; Keq> 1

(4) G° <0; Keq< 1

Subtopic:  Electrolytic & Electrochemical Cell | 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 = 1.60 x 10-19 C)

1. 6 x 1023

2. 6 x 1020

3. 3.75 x 1020

4. 7.48 x 1023

Subtopic:  Faraday’s Law of Electrolysis |
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Zinc can be coated on iron to produce galvanised iron but the reverse is not possible. It is because

(1) zinc is lighter than iron

(2) zinc has lower melting point than iron

(3) zinc has lower negative electrode potential than iron

(4) zinc has higher negative electrode potential than iron

Subtopic:  Nernst Equation |
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The pressure of H2 required to make the potential of H2-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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The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 x 10-3 S cm-1 at 298 K is:

1. 11.5 S cm2/mol

2. 21.5 S cm2/mol

3. 31.5 S cm2/mol

4. 41.5 S cm2/mol

Subtopic:  Conductance & Conductivity |
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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.  6×1023

2.  6×1020

3.  3.75×1020

4.  7.48×1020

Subtopic:  Faraday’s Law of Electrolysis |
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