Corrosion and its control

In electro chemical cell reduction reaction occurs at.....

• Anode

• Cathode

• Electrolyte

• Salt bridge

The correct statement about following chemical equation are (select all correct answers)

Zn + FeCl₂ → ZnCl₂ + Fe

• Zn is oxidized

• Zn is reduced

• Fe is oxidized

• Fe is reduced

About the corrosion the correct statement is

• Only Iron metal undergo corrosion

• Several metals undergo corrosion

• Copper does not undergo corrosion

• Gases undergo corrosion

With of the following does not relate to dry corrosion

• Oxygen

• Gases like Cl2, CO2, SO2, NOx,

• Inorganic liquid

• Moisture

Oxidation corrosion is more if oxide film is.... (Select all correct answers)

• Porous

• Stable and Non porous

• Un stable

• Volatile

Corrosion is.......... process

• Oxidation

• Reduction

• Vaporization

• Cooling

In wet (electrochemical) corrosion ...... part undergo corrosion

• Cathode

• Anode

• Electrolyte

• All of the above

Chemical formula of brown color Iron rust

• Fe₃O₄

• Fe₂O₃. 3H₂O

• FeSO₄

• Fe(OH)₂

The metal with high reduction potential in galvanic series acts as

• Anode and undergo corrosion

• Cathode and undergo corrosion

• Anode and protected

• Cathode and protected

When the metal partly submerged in to water, the part of the metal below waterline acts as........ and...........

• Cathode, protected

• Anode, protected

• Anode, corroded

• Cathode, corroded