CBSE Class 12 Chemistry Electrochemistry Board Exam Notes

Download CBSE Class 12 Chemistry Electrochemistry Board Exam Notes in PDF format. All Revision notes for Class 12 Chemistry have been designed as per the latest syllabus and updated chapters given in your textbook for Chemistry in Class 12. Our teachers have designed these concept notes for the benefit of Class 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Chemistry for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Chemistry given on studiestoday

Revision Notes for Class 12 Chemistry Unit 03 Electrochemistry

Class 12 Chemistry students should refer to the following concepts and notes for Unit 03 Electrochemistry in Class 12. These exam notes for Class 12 Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks

Unit 03 Electrochemistry Notes Class 12 Chemistry

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
 CBSE-Class-12-Chemistry-Electrochemistry-Board-Exam-Notes

Frequently asked question
1 Mark
1).What is meant by limiting molar conductivity?
Ans Molar conductivity of an electrolyte at infinite dilution.

2.) Give the relationship between molar conductivity and specific conductivity ?
Ans. ᴧm = k (1000\M)

3.) What is meant by limiting molar conductivity ?
Ans. The molar conductivity of a solution at infinite dilution is called limiting molar conductivity

4.) What is the unit of molar conductivity?
Ans . ohm–1cm2mol–1

5.) What is the effect of dilution of concentration on specific conductance ?
Ans. Specific conductance decrease with dilution because it is the conduction power of ion present in unit volume of solution and number of ion in unit volume decreases on dilution. Specific conductance increases with concentration.

6.) What type of metals can be used in cathodic protection of iron against rusting?
Ans. A metal which is more electropositive than iron i.e. having lower reduction potential. Example- Zn, Mg etc.

7. Why mercury cell gives constant voltage throughout its life?
Ans. As the overall reaction does not involve any ion in solution whose conc. can change during its life.
A statement of assertion is followed by a statement of reason. Mark the correct choice from the options given below:
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false.

1. Assertion : Current stops flowing when Ecell = 0.
Reason : Equilibrium of the cell reaction is attained. ( Ans - a)

2. Assertion : A standard hydrogen electrode is also called reversible electrode.
Reason : It can act on both as anode as well as cathode in an electrochemical cell.
( Ans - a)

3. Assertion : Kohlrausch law helps to find the molar conductivity of weak electrolyte at infinite dilution.
Reason : Molar conductivity of a weak electrolyte at infinite dilution cannot be determined experimentally. ( Ans - a)

4. Assertion : When a copper wire is dipped in silver nitrate solution, there is no change in the colour of the solution.
Reason : Copper cannot displace silver from its salt solution. ( Ans - d)

5. Assertion : Fluorine is the best oxidising agent.
Reason : Fluorine has highest reduction potential. ( Ans - a)

One - word answer
1. How much electricity in terms of Faraday is required to produce 100g of Ca from molten CaCl2 ? ( 5F)
2. Name the solid substance produced, during the discharge of lead- storage battery.

( Ans - Lead sulphate)


2 marks
1. What is fuel cell ? Write two chemicals which can be used as fuel.
Ans . The cell which converts combustion energy of fuel into electricity .
Methane and hydrogen can be used as fuel 2H2(g) + 4OH(aq) → 4H2O(l) + 4e O2 + 2H2O (l) + 4e →4OH(aq)

2.) What type of battery is the lead storage battery? Write the anode and the cathode reaction and the overall reaction occurring when current is drawn from it ( reaction during discharge of it )
Ans. Lead storage battery is the secondary cell. So it can be recharged by passing direct current through it .
Discharge reaction –
At anode : Pb(s) + SO4
2–(aq) → PbSO4 (s) +2e
At cathode: PbO2(s) + SO4
2–(aq) + 4H+(aq) + 2e →2PbSO4 (aq) +2H2O(l) Overall solution :
Pb + PbO2+ 4H+ + SO4
2–(aq) → 2PbSO4 + 2H2O

3.) How many moles of mercury will be produced by electrolysing 1.0 M Hg (NO3)2 solution with a current of 2.00 A for three hours ?
Molar mass of Hg(NO3)2= 200.6 g/mol
Ans . Current = 2A
Time = 3h = 3(60)(60)s
w = ZIt
Z for Hg in compound =200.6/2F
w= 200.6x2x (3)(60)(60)/2(96500)
w= 22.45g
number of moles = 22.45\200.6 = 0.112 mol

4.) Represent the galvanic cell in which the following reactions take place
Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s)
i.) Which one of the electrodes is negatively charged ?
ii.) Write the reaction taking place at each of t he electrodes.
iii.) Name the carrier of current within the cell.
Ans .The cell is represented as
Zn(s) │Zn2+(aq) ││Ag+(aq) │Ag(s) │
i) Zn electrode is negatively charged
ii) At anode
Zn(s) → Zn2+ + 2e
At cathode
Ag+(aq) + e → Ag(s)

 
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CBSE Class 12 Chemistry Unit 03 Electrochemistry Notes

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Notes for Chemistry CBSE Class 12 Unit 03 Electrochemistry

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Unit 03 Electrochemistry Notes for Chemistry CBSE Class 12

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Unit 03 Electrochemistry CBSE Class 12 Chemistry Notes

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Notes for CBSE Chemistry Class 12 Unit 03 Electrochemistry

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