Which of the following is not true in relation to galvanic corrosion? a it takes place between two dissimilar metals b the metals must be in contact so that electrons can flow between them c one material acts as anode the other as cathode d it can be prevented by blocking either electron flow between the metals or ion flow between the metals the cathode will suffer material loss (corrosion) e

the cathode will suffer material loss

Explanation:

Galvanic corrosion is a type of corrosion which is caused due to difference in electrode potential of two metals.

Thus it is true that: it takes place between two dissimilar metals

the metal with less standard electrode potential will undergo corrosion as it will act as anode and the other will acts as cathode. The electron transfer will occur only when the cathode and anode are in direct contact with each other, thus it is true to say that,

the metals must be in contact so that electrons can flow between them

one material acts as anode the other as cathode

The one and best way to prevent galvanic corrosion is two block the direct contact between the two metals so that there cannot be any electron flow between cathode and anode hence we use rubber gasket kind of insulating material.

The anode undergoes oxidation and lose electrons and it is the one which suffers material loss in the process. Hence the given statement that the cathode will suffer material loss is wrong.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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