Corrosion & its Prevention

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Email *

Full name of student *

Corrosion is *

1 point

Oxidation of metal

Destruction of metal

deterioration of metal

All of the above

The rate of dry corrosion is fast as compared to wet corrosion. *

1 point

True

False

In ____ corrosion direct attack of chemicals takes place on the metal surface. *

1 point

Dry

Wet

electrochemical

Galvanic

On metal surface suppose porous oxide film is formed then that is protective in nature. *

1 point

True

False

Rate of corrosion is very high in ___ *

1 point

stable oxide layer

unstable oxide layer

volatile oxide layer

non volatile oxide layer

According to Pilling-Bedworth rule, The volume of the oxide layer is greater than the volume of the metal then the oxide layer is___in nature. *

1 point

Porous

Non-porous

non-protective

cannot predict

Water and two different metals when comes in contact with each other, the type of corrosion is *

1 point

dry corrosion

simple corrosion

wet corrosion

water corrosion

Metal whose corrosion takes place is *

1 point

active metal

an anode

passive metal

cathode

both a and b

Tin coated sheets passed from palm oil ___ *

1 point

to prevent from further oxidation

to prevent from further reduction

to increase adhering capacity

to increase durability.

Gold is corroded in *

1 point

H2SO4

acidic buffer solution

Mercury

Strong electrolyte soltiion.

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