LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIRST SEMESTER – APRIL 2011

CH 1502/CH 5501 – ANALYTICAL CHEMISTRY

 

 

 

Date : 19-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

 

PART -A

Answer ALL the questions                                                                                          (10 x2 =20 marks)

 

1. Give the threshold limits of vapor concentration of mercury and formaldehyde.
2. How is ether handled in the laboratory?
3. A titration is repeated four times and the titre values are 10.1, 9.9, 10.0 and              10.2 ml. calculate the mean.
4. How is benzoic acid recrystallised?
5. What is R_f value?
6. Calculate the molarity when you dissolve 4.9 g of K₂Cr₂O₇ in 1000 ml of water.
7. Mention two adsorbents used in Column chromatography.
8. Mention any two indications used in the titration of a strong acid against a strong base?
9. What are adsorption indicators? Give an example.
10. Define co-precipitation.

PART – B

 

Answer any EIGHT questions                                                                                       (8 x 5 =40 marks)      

 

1. Describe the calibration of a pipette and standard flask.
2. Analysis of a sample of iron ore gave the following percentage values for the iron content 7.08,7.21.7.12,7.09,7.16, 7.14,7.07,7.14,7.18,7.11.Calculate the mean, standard deviation and coefficient of variation for the values.
3. Explain, briefly, the various steps involved in fractional distillation.
4. Discuss the preparation of chromatogram in Thin Layer chromatography.
5. What are the criteria for a primary standard? Give an example for primary and secondary standard.
6. Explain the principle of complexiometric titration with a suitable example.
7. Discuss the factors affecting solubility of precipitates.
8. Sketch the thermogram of calcium oxalate monohydrate.  Discuss the thermo gravimetric analysis technique.

 

 

1. Write briefly on ion-exchange chromatography.
2. What is normal error analysis curve? Give its significance.
3. Calculate the pH and the [H⁺] and [OH^–] concentrations of a 0.005 M solution of Ba (OH) ₂ in water at 25⁰C.
4. Calculate the molar solubility of Ag₂CrO₄ in water at 25⁰C at K_sp =9 x 10^-12.

 

PART – C

Answer any FOUR questions                                                                                   (4 x 10 =40 marks)      

 

1. Discuss the principle, experimental technique and instrumentation technique of Gas chromatography.
2. Explain in detail the types of errors.
3. Write briefly on a. Sublimation    b. Factors affecting R_f value.
4. Discuss the theory of acid- base indicators with suitable examples.
5. How is chloride determined by Volhard’s method?
6. a. Discuss the factors affecting TG and DTA thermograms.

1. Mention any three requisites of a good wash liquid in gravimeric analysis.

 

Go To Main Page

 

 

Latest Govt Job & Exam Updates:

View Full List ...