UNIT – III – ELECTROCHEMISTRY
PART – A ( 2 Marks)
1. What is a cell? Mention its types.
2. Define the terms (i) single electrode potential (ii) Electrochemical cells.
3. Define Helmholtz electrical double layer.
HS1103- Engineering chemistry - I
Kings college of Engineering
4. Write Nernst equation.
5. Define a reference electrode. Give one example.
6. What is electromotive series? What is its significance?
7. What is electrode concentration cell? Give one example.
8. Find the potential of the cell in which the following reactions takes place
at 250 C.
Zn (s) + Cu2+ (0.02M) ® Cu(s) + Zn2+ (0.4M)
9. What is electro chemical cell?
10. Why can glass electrode not be used for a solution of high alkalinity?
11. What are reversible & irreversible cells?
12. What are the advantages of conductometric titrations?
PART B [ 16 marks]
1. (i) Derive Nernst equation. Give its significances. (8)
(ii) What are reference electrodes? Describe any two reference electrodes
with neat diagram and mention their uses. (8)
2. (i) Describe a glass electrode. How can it be used for determining the pH
Of a solution? (8)
(ii) How is Emf of a galvanic cell measured by poggendroff’s compensation
method? (5)
(iii) Consider the cell reaction,
Zn(s) +Fe2+ (0.005 M) Zn2+ (0.01 M) + Fe(s)
Given that the standard emf of the cell at 298 K is 0.323 V. Construct the cell
and
Calculate the emf of the cell. (3)
3. (i) What are Reference Electrode? Explain the types with neat diagrams and
mention their uses (8)
HS1103- Engineering chemistry - I
Kings college of Engineering
(ii) What is the principle underlying conductometric titration? Explain acid-base
titrations with neat graph. (8)
4(i)Describe a glass electrode. How can it be used for determining the pH of a
solution? (8)
(ii) What is the principle underlying Potentiometric titration? Explain Redox
titrations with neat graph. (8)
5.Describe the following electrodes giving the diagram, electrode notation and
Electrode reaction. (i) Calomel electrode (ii) Glass Electrode (iii) Quin hydrone
electrode (iv) Standard H2 electrode [16]