standard electrode potential of hydrogen
its electrical conductivity
nature of oxides formed
relative tendencies of oxidation
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The correct answer is D. relative tendencies of oxidation.
Cathodic protection is a technique used to prevent corrosion of metals by making them the cathode (negative electrode) in an electrochemical cell. This is typically achieved by connecting the metal to be protected to a more reactive metal (sacrificial anode) that will corrode instead.
The principle behind cathodic protection is based on the relative tendencies of oxidation, also known as the galvanic series. By connecting the metal to be protected to a more reactive metal, the oxidation reaction is shifted from the protected metal to the sacrificial anode, thereby preventing corrosion.
The other options are not correct:
A. Standard electrode potential of hydrogen is a measure of the electrode potential of hydrogen gas at standard conditions, but it's not directly related to cathodic protection.
B. Electrical conductivity is an important property of materials, but it's not the principle behind cathodic protection.
C. Nature of oxides formed is related to corrosion, but it's not the primary principle behind cathodic protection.
The answer is "A) standard electrode potential of hydrogen"! Cathodic protection is a technique used to prevent metals from corroding. It involves using a more "active" metal to act as a sacrificial anode and protecting the less active metal from corrosion. The "activity" of a metal is determined by its standard electrode potential, so this is what determines whether it can act as a cathode or anode.
