11.

12.
13.
14.
15.

16.

18.
19,
20.
21.
29.

23.
24.
25.
26.

28.

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2 C 20095

Section B (Short Answer)

Answer any ten questions.
Each question carries 2 marks.

The specific conductance of an electrolyte decreases and equivalent conductance increases with
dilution. Give reason.

Define liquid junction potential. How it can be eliminated ?
State and explain the Nernst equation for EMF of a cell.
What is a calomel electrode ? Give the reaction taking place at the calomel electrode.
What is meant by buffer action ? Explain with an example.
Calculate the pH of a solution obtained by mixing 800 ml of 0.05M HCl and 200 ml of 0.1M NaOH.
State Raoult’s Law of ideal solutions.
What is azeotropic mixture ?
What are miller indices ? Sketch 110 plane.
State Steno’s law of constancy of interfacial angles.
Distinguish between extrinsic and intrinsic semi-conductors.
What is meant by colour centres ? Give an example.
(10 x 2 = 20 marks)
Section C (Paragraph)

Answer any five questions.
Each question carries 6 marks.

Explain Debye Falkenhagen and Wien effects.
Derive an expression for the emf of a concentration cell with transference.
What are fuel cells ? Describe H,-O, fuel cell and its cell reactions.

Explain the electro-chemical theory of rusting of iron. What are the methods to prevent
corrosion ?

Discuss the application of common ion effect and solubility product in inorganic qualitative analysis.

A buffer solution contains 0.2 mole of NH,OH and 0.5 mole of NH Cl per litre. Calculate the pH of
the solution. The dissociation constant of NH,OH is 1.8 x 105.

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