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Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
B.PHARM - SEMESTER- IT EXAMINATION — SUMMER - 2018
Subject Code: 2220002 Date: 24/05/2018
Subject Name: Pharmaceutical Chemistry-II(Physical Chemistry)
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Time: 10:30 AM TO 01:30 PM Total Marks: 80
Instructions:
- Attempt any five questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define: surface tension. Explain drop weight method for the determination of the 06 surface tension.
(b) Define viscosity & write units of it. Describe principle of Ostwald’s viscometer. 05
(c) Define: (1) Refractive index (11) Parachor (111) Specific rotation (iv) Optical 05 activity (v) Dipole moment
Q.2 (a) State and explain Raoult’s law of dilute solution. Discuss deviation of real 06 solution from the Law.
(b) Define: Molarity and Normality. Explain Henry’s law in brief. 05
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(c) Define colligative property. Enlist different types of colligative properties. 05 Describe briefly lowering of the vapour pressure.
Q.3 (a) State and explain first Law of Thermodynamics. 06
(b) State and explain phase rule. Describe phase diagram of water. 05
(c) Define Thermodynamics. Write a detail note on Carnot cycle. 05
Q.4 (a) What is an adsorption isotherm? Discuss in detail Langmuir adsorption isotherm. 06
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(b) Enlist applications of adsorption. Describe in detail pharmaceutical application. 05
(c) Differentiate: (1) Physical adsorption and Chemical adsorption. 05 (2) Adsorption and Absorption
Q.5 (a) Derive the rate constant equation for first order reaction. Explain how to derive 06 half-life equation for first order reaction.
(b) Define chemical kinetics. Discuss the methods of determination of order of a 05 reaction.
(c) Paracetamol solution has initial concentration 500 mg/100 ml. After 40 days the 05 concentration becomes 300 mg/100 ml. The reaction follows first order kinetic. Calculate half-life and reaction rate constant.
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Q.6 (a) What is Photochemistry? Draw the Jablonski diagram & explain the 06 consequences of light absorption.
(b) Define quantum yield of a photochemical reaction. Give reasons of high and low 05 quantum yield.
(c) Explain the terms: (i) Photochemical reaction (ii) Photosensitiser 05 (iii) Fluorescence (iv) Phosphorescence (v) Thermopile
Q.7 (a) 06 Differentiate the following pair:
(1) Molecularity of a reaction & order of a reaction.
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(2) Homocatalysis & Heterocatalysis.
(b) Explain the terms: (1) Adiabatic process (ii) Heat of Neutralization (iii) Entropy 05 (iv) Heat of combustion (v) Joule-Thomson effect
(c) Define the term catalyst. Write a note on “Acid- Base and Enzyme catalysis”. 05
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