Msc sem 1 paper (2017).pdf

## THE MAHARAJA SAYAJIRAO UNIVERSITY OF BARODA M.Sc. Programme Semester I Subject: Chemistry ### Course Title: Physical Chemistry I (3 credits) Course Code: CHE 2103 Total Marks: 70 (Part I 28 + Part II 42) Date: 9th November, 2017 Thursday Time: 11.30 am to 2.30 pm Signature of Examiners Note: i...

## THE MAHARAJA SAYAJIRAO UNIVERSITY OF BARODA M.Sc. Programme Semester I Subject: Chemistry ### Course Title: Physical Chemistry I (3 credits) Course Code: CHE 2103 Total Marks: 70 (Part I 28 + Part II 42) Date: 9th November, 2017 Thursday Time: 11.30 am to 2.30 pm Signature of Examiners Note: i) The question is divided into two parts- Part I (Objective) and Part II (Subjective). ii) Answer of Objective questions should be written in the space provided. iii) Part I (Objective) should be submitted within first one hour of the commencement of examination. After its submission Part II (Subjective) question paper will be issued. #### PART I (OBJECTIVE) Q1 A Answer the following i. ___ of gas represents the transport property of the gas. ii. ___ of the gas is due to the change in the momentum of gaseous molecules. iii. According to Kinetic theory of gases, ____ of a gas is a measure of the kinetic energy of the gas. iv. Poisseuille's equation is valid for compressible fluid only. ____ (TRUE/FALSE) v. Mean free path of gas is directly proportion to the pressure of the gas. ____ (TRUE/FALSE) vi. Rankine Method is used for measurement of viscosity of gas. ____ (TRUE/FALSE) vii. ____ of gas is directly proportion to the viscosity of gas. ____ (TRUE/FALSE) viii. The sphere of influence (B) or a molecule is equal to eight times its volume. (TRUE/FALSE) ix. Show a graphical representation of Maxwell's distribution of molecular velocity and label the x-y axis. Q2 A Answer the following i. Write the name of any two methods for study of fast reaction and also state the half-life range in which it can be used. ii. Give one example of enzymatic reaction. iii. Write the name of two theories used for the study of reaction rate. iv. Order and molecularity of complex reactions are usually different. ____ (TRUE/FALSE) v. Steady state approximation is applicable for stable species. ____ (TRUE / FALSE) vi. Lindemann's theory of chemical kinetics is applicable for bimolecular reactions. ____ (TRUE/FALSE) vii. Chain growth polymerization is an example of complex reaction. ____ (TRUE/FALSE) viii. Activation energy of a reaction changes with the change in temperature. ____ (TRUE/FALSE) Q3 A Answer the following i. Define: Amphipathy ii. Fill in the blank. HLB = Σ + Σ + ____ iii. The layer of counter ions around the micelle is called ____ iv. The full name of acronym CTAB is ____ v. Name the two theoretical models which explain micelle formation. vi. Give one difference between normal and reverse micelle. vii. Define: Aggregation number viii. State True/False. 1. The CMC in the aqueous solution reflects the degree of binding of the counter ion to the micelle. ____ 2. When Carbon-Carbon double bond is introduced in the hydrophobic chain the CMC becomes higher than that of corresponding saturated hydrocarbon. ____ ********End of Part 1******** ## PART II (SUBJECTIVE) Q1 A. With the help of Maxwell's distribution of molecular velocity expression for ideal gas, derive formulas for a) root mean square velocity and b) average velocity B. For oxygen gas at 25°C, calculate the number of collisions per second per molecules. Given the pressure of gas = 1atm and collision diameter of oxygen molecule = 361 picometer. C. Define Mean free path and derive a relationship between mean free path and viscosity of gas. ### OR C. What do you understand by transport properties of gases? Derive an expression for coefficient of thermal conductivity of gas and show it is independent of pressure. Q2 A. Discuss the principle of relaxation method for a process which is first order in both directions. B. Discuss the kinetics of ____ complex reaction with the help of suitable example. Also derive the expression for the rate constant of the reaction. a) Reversible b) parallel c) free radical C. Discuss the kinetics of H2 - 02 reaction and explain the explosion limit of this reaction. Q3 A. Attempt Any Three. i. What do you mean by surface active agents? Classify with suitable examples. ii. Write a note on: Packing parameters and their importance for structure determination of micellar aggregates. iii. Discuss thermodynamics of micelle formation. iv. Define CMC. Show graphically how the physical properties of solution of surfactants such as molar conductance, surface tension, osmotic pressure change at the CMC. v. Discuss Worm like micelles with its importance in the fields. B. What does HLB stands for? What is its significance? Scanned by CamScanner