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
 
 
Please click the link below to download pdf file of CBSE Class 12 Chemistry Electrochemistry Board Exam Notes

Tags: 

 


Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

The CBSE Science Challenge 2020

The CBSE Science Challenge - 2020 Science is inexplicably linked with our lives and helps us to understand the world around us better. Scientific and technological developments contribute to progress and help improve our standards of living. By engaging with this...

BRICS International Online Mathematics Competition

BRICSMATH.COM is an annual International Online Competition in Mathematics, for students of classes I – XII of 07 BRICS countries (Brazil, Russia, India, China and South Africa, Indonesia and Vietnam). The competition is held online on the website www.bricsmath.com and...

How to Effectively Answer CBSE Board Examination Question Papers

The intend of this article is to share the best ways to answer the CBSE Board Examination. Usually most of the students tend to become nervous at the times of the board examination. In this article we will share the most effective ways to make the answers to the CBSE...

Tricks for Utilization of additional time introduced in CBSE Board Exams

Tricks for Proper Utilization of Add-On 15 Minutes introduced in CBSE Board Exams The intend of this article is to share the best suggestions and guidelines to utilize the extra 15 minutes provided for reading the question paper in CBSE Board Examination. These extra...

Digital Marks Sheets Migration Certificates and Pass Certificates

CBSE pioneered in providing digital academic documents through its academic repository called “Parinam Manjusha” and DigiLocker.  As on now result data from 2004 till this year is available in the repository.  Approx. 12 crores digital academic documents are available...

×
Studies Today