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Physical Chemistry Ii Question Paper

Physical Chemistry Ii

Course:Bachelor Of Science In Biochemistry

Institution: Egerton University question papers

Exam Year:

CHEMISTRY DEPARTMENT

CHEM 202-PHYSICAL CHEM 11

CAT 2

SECTION A-18 MARKS

CHOOSE THE CORRECT ANSWER

1.Which one of the following solvents is not polar?

a) Diethylether

b) Water

c) Pyridine

d) Carbon tetrachloride

e) Acetone.

2.Pyridinium acetate is a salt obtained by reacting pyridine with acetic acid.

i) Determine the pH of 0.1M pyridinium acetate solution.

a) 3.56

(b) 9.00

(c) 5.00

(d) 7.00

(e) 10.00

ii) Calculate the hydrolysis constant (Kh) for this solution.

a) 0.32

b) 5.68x10-10

c) 3.2

d) 5.62x10-5

e) 5.68x10-9

3.Calculate the vapor pressure of acetone over an aqueous solution in which the mole fraction of acetone is 0.072 at 300k.(Henry's law constant=1.5atm).

a) 0.216atm

b) 0.048atm

c) 1.5 atm

d) 21.6atm

e) 0.108atm

4.Select the salt whose solution is likely to be acid.

a) Sodium formate

b) ammonium acetate

c) Potassium sulphate

d) Potassium carbonate

e) Methylaminiiumcyanide

5. A solution obtained by mixing chloroform (CHCL3) with diethylether would show:-

a) Immicibility

b) Ideal behavior

c) Positive deviation from ideal behavior

d) Azeotropic mixture over all the composition

e) Negative deviation from ideal behavior.

SECTION B (32 MARKS)

1 (a) For a 0.01M methylaminium chloride salt solution;

i) Predict,giving reasons whether this solution is acidic or basic.(2 marks)

ii) Derive the expression for the hydrolysis constant (Kh) of this solution in terms of Kw,Kb.(5 marks)

b) Calculate (i) the hydrolysis constant (ii) degree of hydrolysis and (iii) pH of this solution.(10 marks)

2.(a) (i) Define an ideal solution(3 marks)

ii) State Henry's law.(2 marks)

b) (i) It is found that an ideal solution of benzene and toluene containing 0.6589 mole fraction of benzene boils at 880C.At this temperature,the vapor pressure of pure benzene and toluene are 1.259 and 0.4993 atm respectively.What is the composition of the vapor that boils off from this solution?(5marks)

iii) Draw a well labeled vapor pressure-composition diagram of a no-ideal solution showing very large positive deviations from Raoult's law (indicate both the liquid and the vapor phases).(5 marks)

Useful data

R=8.314Jk-1 mole-1=0.082056 L atm mole-1 K-1

1 atm=101325N/M2,t0 c=(t+73)

ACID Ka BASE Kb

Acetic acid=1.76x10-5 mol/L Pyridine=1.78x10-9 mol/L

HCN=7.20X10-10 MOL/I Ammonium hydroxide=1.76x10-5 mol/L

Kw=1.00x10-14 mol2/L Methylamine=4.54x10-4 mol/L

Physical Chemistry Ii Question Paper

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