10009 . 2 ∣∎∎∎∎∎∎∎

10. Whatis meant by potentiometric titrations ? Mention two merits of potentiometric
titrations.

11. Give the principle of column chromatography. List the various steps to be
undertaken in this method.

12. Draw the structure of bifunctional silicon chloride. How silicone rubber prepared
from it ?

13. An oil of unknown viscosity-index has a Saybolt universal viscosity of 58 seconds
at 210°F and of 580 seconds at 100°F. The high viscosity index standard
(Pennsylvanian) oil has Saybolt viscosity of 58 seconds at 210°F and 430 seconds
at 100°F. The low viscosity index standard (Gulf oil) has a Saybolt universal
viscosity of 58 seconds at 210°F and 780 seconds at 100°F. Calculate the
viscosity index of oil sample.

14. Whatis natural gas ? Distinguish between LNG and CNG.

15. Whatis disinfection ? Give the advantages and disadvantages of UV disinfection
of water.

16. Asample of water on analysis gives following results. 622+ = 320 mg/L,
۸۷۵۶+ = 72 mg/L, HCO; =610 mg/L, © = 355 mg/L and Na* = 23 mg/L. Calculate

the temporary and permanent hardness of water sample. (8x3=24 Marks)

PART-C

Each question carries 10 marks.
17. a) Howcan you distinguish NMR spectrum of CH,CH,Cl and CH.,CHCI, applying
the concept of spin-spin splitting ?

b) Which of the following molecules show UV-visible absorption ? Give reason
(i) ethane (ii) butadiene (iii) benzene (iv) phenol

௦) What is a spectrometer ? Write the principal components of UV-visible

spectrometer. (3+3+4)

OR

18. a) Predict NMR spectrum of CH, - CHC! - 6113.
b) Write the theory of vibrational spectroscopy.
9) Sketch the various modes of vibrations possible for 00. Which are IR

active ? Write reason for ۷۸۱۱۲ ancwer

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