When a copper wire is immersed in a solution of AgNO3, the colour of solution becomes blue because copper:

(1) forms a soluble complex with AgNO3

(2) is oxidised to Cu2+

(3) is reduced to Cu2-

(4) splits up into atoic form and dissolves

Subtopic:  Electrochemical Series |
 85%
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The specific conductance of a 0.1 M KCl solution at 23°C is 0.012 Ω-1cm-1.
The resistance of the cell containing the solution at the same temperature was found to be 55 Ω. The cell constant will be:

1. 0.142 cm–1
2. 0.66 cm–1
3. 0.918 cm–1
4. 1.12 cm–1

Subtopic:  Conductance & Conductivity |
 89%
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Without losing its concentration ZnCl2 solution cannot be kept in contact with.

(1) Au

(2) Al

(3) Pb

(4) Ag

Subtopic:  Electrochemical Series |
 75%
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Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through molten Al2O3 for 6 h, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27g mol-1)

1. 9.0 x 103

2.  8.1 x 104 g

3.  2.4 x 105 g

4.  1.3 x 104 g

Subtopic:  Faraday’s Law of Electrolysis |
 68%
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The standard reduction potential at 290 K for the following half reactions are,

(i) Zn2+ + 2e— → Zn(s);      E° = -0.762 V

(ii) Cr3+ + 3e → Cr(s);          E° = -0.740 V

(iii) 2H+ + 2e → H2(g); ·      E° = -0.000 V

(iv) Fe3+ + e → Fe2+;         E° = +0.77V

Which is the strongest reducing agent?

(1) Zn

(2) Cr

(3) Fe2+

(4) H2

Subtopic:  Electrode & Electrode Potential |
 79%
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The Zn acts as sacrificial or cathodic protection to prevent rusting of iron because:

(1) EOP of Zn < EOP of Fe

(2) EOP of Zn > EOP of Fe

(3) EOP of Zn = EOP of fe

(4) Zn is cheaper than iron

Subtopic:  Corrosion |
 77%
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What mass of copper will be deposited by passing 2 Faraday of electricity through a solution of Cu(II) salt?

(1) 35.6 g

(2) 63.5 g

(3) 6.35 g

(4) 3.56 g

 

Subtopic:  Faraday’s Law of Electrolysis |
 86%
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The same amount of electricity was passed through two cells containing molten Al2O3 and molten NaCl. If 1.8g of Al were liberated in one cell, the amount of Na liberated in the other cell is:

(1) 4.6 g

(2) 2.3 g

(3) 6.4 g

(4) 3.2 g

Subtopic:  Faraday’s Law of Electrolysis |
 76%
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Standard Reduction electrode potential of three metals X, Y and Z are -1.2V, + 0.5V and -3V respectively. The reducing power of these metals will be 

(1) Y>X>Z

(2) Z>X>Y

(3) X>Y>Z

(4) Y>Z>X

Subtopic:  Electrochemical Series |
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How many columbs of electricity are consumed when 100 mA current is passed through a solution of AgNO3 for 30 minute during an electrolysis experiment?

(1) 108

(2) 18000

(3) 180

(4) 3000

Subtopic:  Faraday’s Law of Electrolysis |
 81%
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