Question

10.1. (Multiple choice) Which one of the following statements is true? (a) The corrosion of a metal immersed in acid requires the presence of oxygen. (b) Cathodic protection involves attaching a more cathodic material to a metal that you want to protect from corrosion. If two pieces of clean, unpainted 1040 steel sheet are immersed near to each other (but not touching) in seawater, they will corrode at the same rate. (c) (d) Corrosion always involves the transfer of electrons. (e) If two different metals are in contact with each other while immersed in an aqueous environment, the metal with the smaller standard electrode potential will corrode.

Answer 1

a) TRUE

For Corrosion of metals 3 things are must which are

1) Metal

2) Water or moisture

3) Oxygen

b) FALSE

Cathodic protection involves attaching an anode with the metal which is to be protected. The anode metal donates electrons to the metal which is to be protected thereby gets corroded.

c) TRUE

The corrosion rate of metal depends upon the following factors

1) Oxygen

2) Temperature

3) Chemical Salts

4) Humidity

Since the plates are very close to each other so all these factors are likely to remain unchanged hence the corrosion rate will remain same

d) TRUE

Yes corrosion always involves transfer of electrons

e) TRUE

Smaller standard electrode potential means the metal electrode is donating electrons to the other electrode which means it is acting as an anode. We know that the anode always get corroded.