CBSE Class 12 Chemistry Electrochemistry Board Exam Notes

KEY POINTS

Resistance – obstacle to the flow of electricity.
 
Resistivity – resistance offered by the conductor when it is of unit length and has unit area of cross section.
 
Conductivity – conductance of the ions present in 1 cubic centimeter solution. It is the reciprocal of resistivity.
 
1. Effect of dilution on conductivity – conductivity decreases with dilution because number of ions per ml of solution decreases.
2. Effect of dilution on molar conductivity – molar conductivity of strong electrolyte increases with dilution because ionic mobility increases, whereas molar conductivity of weak electrolyte increases because degree of dissociation of it increases so number of ions increase .
3. Kohlrausch law – conductivity of an electrolyte at infinite dilution is the sum of individual contribution of anion and cation of the electrolyte .
4. Faraday's law of electrolysis ‐ First law – amount of substance deposited at the electrode during electrolysis is directly proportional to the quantity of electricity passed through electrolyte .
Second law – when same amount of electricity is passed through different electrolytic solution, amount of substance deposited is proportional to the chemical equivalent weights .
5. Fuel cell – it converts combustion energy of fue l into electricity . H2 and CH4 can be used as fuel in it .
6. Corrosion – corrosion of metal is an electro chemical phenomenon .
 
CBSE Class 12 Chemistry Electrochemistry Board Exam Notes
 
Rate of corrosion increase in acidic medium also increase in the presence of salt and oxygen but rate decreases in basic medium .
 
Prevention of corrosion

1. By Galvanization: ‐ coating of Zn on iron
2. By Cathodic protection :‐ Mg is joined with iron which behaves like anode and iron as cathode .
3. By painting and oiling
 
 
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