Differentiate molecular dispersion and colloidal dispersion with example.
[6 marks]Describe any two kinetic properties of colloids.
[5 marks]Describe the Kawakita and Heckel equations with respect to powder compression.
[5 marks]With the help of a diagram discuss the principle and working of a Searle type of cup and bob viscometer.
[6 marks]Write a note on measurement of thixotropic coefficient.
[5 marks]With respect to Rheology describe how aqueous hydroxy propyl methyl system would behave under stress.
[5 marks]Briefly discuss the theory of sedimentation in settling of suspension.
[6 marks]Give a brief account on theories of emulsification.
[5 marks]Explain identification test for emulsion.
[5 marks]Describe suitable method for particle volume measurement.
[6 marks]What is specific surface. Calculate specific surface for a spherical particle.
[5 marks]Discuss the derived properties of powder.
[5 marks]What is meant by controlled flocculation? Discuss the various means by which controlled flocculation can be achieved?
[6 marks]Explain accelerated stability testing in expiration dating of pharmaceutical dosage forms.
[5 marks]Discuss any one method for determining true density and bulk density. Q. 6 (a) Explain zero order and pseudo zero order reaction with examples and suitable applications.
[6 marks]Asolution of a drug contained 500 units/ml when prepared. It was analyzed after 40 days and was found to contain 300 units/ml. Assuming it a first order reaction, find out half life and shelf life of the solution.
[5 marks]Discuss the various means of stabilization of product which is sensitive to oxidation.
[5 marks]Aplastic material was found to have a yield value of 5200 dyne/cm2. At shearing stresses above the yield value, shearing stress and rate of shear were linearly proportional. If rate of shear is 150 sec-1 when shearing stress was 8000dyne/cm2, calculate the mobility of the system. Page 1 of
[2 marks]Compute the sedimentation volume and degree of flocculation of a 5% w/v suspension of magnesium carbonate in water. The initial volume is 100 ml and final volume of sediment in 30 ml, the deflocculated sedimentation volume is 0.23.
[5 marks]Asample of powdered zinc oxide, density 5.60 g/cm3, is allowed to settle under the gravitational force, 981 cm/sec2, at 25°C. The rate of settling is calculated to be 7.30 X 10-3 cm/sec; the density of the medium is 1.01 gm/cm3 and viscosity is given an 0.01 poise. Calculate the appropriate diameter of zinc oxide powder. Page 2 of
[2 marks]