Multiple Choice Questions on

Understanding Corrosion

Questions 6 - 10

Page 2 of 4


6.

A galvanic cell is formed

[  ]

when two metals are immersed in solutions differing in concentration

[  ]

when two different metals are immersed in one electrolyte

[  ]

when two different metals are exposed to air

[  ]

when two metals are brought close together and electrically insulated from one another


7.

In concentration cells

[  ]

the metal is in contact with two half cells having the same electrolyte but at different concentrations

[  ]

the metal is in contact with two half cells, having the same electrolytes with the same concentration

[  ]

no liquid junction is present

[  ]

there is no migration of ions from one electrolyte to another electrolyte


8.

In order to minimize the liquid function potential

[  ]

a KCl salt bridge is introduced between the two electrolytes

[  ]

non-porous barriers are introduced in the electrolyte

[  ]

an electrical connection is made between the two half cells

[  ]

oxygen at 1 atmosphere is introduced in the two half cells


9.

If the free energy of a reversible process is negative, it implies that

[  ]

the cell reaction is spontaneous

[  ]

the cell reaction is not spontaneous

[  ]

the cell reaction proceeds from right to left

[  ]

no reaction takes place at all


10.

Which are the two correct forms of Nernst equation:

[  ]

E = E + {RT/nF} ln [ areactants) / (aproducts) ]

[  ]

E = E - {RT/nF} ln [ aproducts) / (areactants) ]

[  ]

E = E + {0.05951/n} ln [ areactants) / (aproducts) ]

[  ]

E = E - {0.05951/n} ln [ aproducts) / (areactants) ]