The diagram below illustrates examples of differential oxygenation corrosion. Th
ID: 521440 • Letter: T
Question
The diagram below illustrates examples of differential oxygenation corrosion. The above diagram shows a piece of iron with a barnacle growing on it: "B" is under the barnacle, and "A" is outside the barnacle. Circle the correct answer. a) "B" is cathode and the oxygen concentration is higher than outside the confines of the barnacle shell "A"; b) "B" is cathode and the oxygen concentration is higher than outside the confines of the barnacle shell "A"; c) "B" is anode and the oxygen concentration is higher than outside the confines of the barnacle shell "A"; d) "B" is anode and the oxygen concentration is higher than outside the confines of the barnacle shell "A"; Local-action cells can be produced with small variations in a) the differences in the amount of stress and surface imperfections b) the composition of metal and orientation of the grain structure c) the dissolved oxygen concentration. d) the amount of moisture and temperature e) all of the above f) none of the above g) Faraday's First Laws of Electrolysis states that the mass of a substance generated by electrolysis is proportional to a) the amount of electricity used. b) the concentration of electrolyte used. c) the concentration of the metal that deposits d) the oxidation number of the metal that deposits. e) the pH of the solution. f) the galvanic series. h) A current of 0.080 A passes through a solution of silver nitrate for 1 hour. How much silver is deposited? a) 0.050 b) 0.100 c) 0.32 d) 1.78 e)3.55 f) 6.70 (Write in)Explanation / Answer
1. The differential oxygeration corrosion,
b) B is cathode and A is anode
2.
Local-action cells can be produced with small variation in,
e) all of the above
g) Faraday's first law states that mass of substance producedby electrolysis related to,
a) amount of electricity used
h) Amount of silver deposited
= 0.080 x 1 x 60 x 60 x 63.546/96500 x 2
= 0.100 g
Answer : b) 0.100