Home
Class 12
CHEMISTRY
Rusting of iron is an electrochemical ph...

Rusting of iron is an electrochemical phenomenon. Explain.

Text Solution

Verified by Experts

Iron metal acts as anode. Impurities in iron piece act as cathode. Moisture on it containing dissolved `CO_2 and O_2` acts as electrolyte. A series of galvanic cells are set up.
Cathodic reaction: `Fe to Fe^(+2)+2e^(-)`
Cathodic reaction: `H_2O+1/2 O_2+2e^(-) to 2OH^(-)`
Ferrous ions gets oxidised to ferric ions and finally forms hydrated ferric oxide (rust).
Promotional Banner

Topper's Solved these Questions

  • ELECTRO-CHEMISTRY

    OSWAAL PUBLICATION|Exercise Topic - 3 ELECTROLYSIS , LAWS OF ELECTROLYSIS, BATTERIES, FUEL CELLS AND CORROSION (LONG ANSWER TYPE QUESTIONS)|4 Videos

  • ELECTRO-CHEMISTRY

    OSWAAL PUBLICATION|Exercise Topic - 3 ELECTROLYSIS , LAWS OF ELECTROLYSIS, BATTERIES, FUEL CELLS AND CORROSION (VERY SHORT ANSWER TYPE QUESTIONS)|6 Videos

  • D - BLOCK ELEMENTS F - BLOCK ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC - 2 (F - BLOCK ELEMENT , LANTHANOIDS AND ACTINOIDS)(LONG ANSWER TYPES QUESTIONS)|6 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC 2 (LONG ANSWER TYPE QUESTIONS-II)|2 Videos

Similar Questions

Explore conceptually related problems

What is electrochemical cell?

What is electrochemical series?

Define electrochemical equivalent.

Hamburger phenomenon explains

What is a primary electrochemical cell?

Which of the following is not anodic reaction in a electrochemical series ?

(a) Most of the metals acquire a dull surface when exposed to air . Name the chemical phenomenon responsible for this process. (b) State the conditions under which the iron articles get rusted . Design an activity to investigate the conditions necessary for rusting .

Describe an activity to show that the rusting of iron occurs in the presence of air and moisture.