BSc. Chemistry-II : Physical Chemistry -Mumbai-April 2019
MUMBAI UNIVERSITY
Subject: Chemistry-II: Physical Chemistry
Semester: 2
[Time: 2.30 Hours]
[Marks: 75]
1) Attempt all questions.
2) All questions carry equal marks.
3)Draw a neat labeled diagram wherever necessary.
4) Use of log table & non-programmable calculator is allowed.
5) For Q.2, Q.3 & Q.4 attempt A&B OR C&D
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Q. 1) Do as directed. (any fifteen)
Define the following terms: (15M)
1) System
2) Adiabatic wall
3) Exothermic reaction
4) Unimolecular reaction
5) Chemical kinetics
6) Redox reaction
7) Reduction
Fill in the blanks:
8) Enthalpy of the system is represented by the symbol ________________.
9) If work is done by the system, W is _____________. (Positive/ Negative)
10) S.I. unit of internal energy is________________.
11) In Second order reaction, the rate of the reaction is proportional to the product of _______________ concentration.
12) The minus sign indicating that concentration of the reactant ____________with time.
Name the following :
13) A process in which volume of the system remains constant.
State True or False:
14) Decomposition of hydrogen peroxide is an example of first-order reaction.
15) The half time require to complete reaction is same for first & second-order reactions.
16) An element that loses an electron to another chemical species in a redox chemical reaction is known as reductant. Balance the following reaction:
17) Fe3O4 + C → Fe + CO
18) S + HNO3 → SO2 + NO2 + H2O
Give one word for the following:
19) A chemical reaction in which reactant involves more than one phase.
20) A molecule that gains electrons.
Q. 2) A) I) Classify the thermodynamic systems based on the nature of the boundary. (4M)
Q. 2) A) ii) Calculate q, w, and ΔE when one mole of monoatomic gas expands adiabatically against a constant external pressure of 1 atm. from volume of 2.0 dm3 to 8.0 dm3 at 300K. (4M)
Q. 2) B) Explain the term ‘Entropy’ and enlist its characteristics. (7M)
OR
Q. 2) C) Discuss the four steps of Carnot Cycle. (8M)
Q. 2) D) State the objective and limitations of thermodynamics. (7M)
Q. 3) A) Derive integrated rate equation for first-order reaction. (8M)
Q. 3) B) Discuss the kinetic characteristics of second-order reaction. (7M)
OR
Q. 3) C) Show that for first-order reaction time to complete first-order reaction is independent of initial concentration. (8M)
Q. 3) D) A second-order reaction with equal initial concentration is 66.67 % complete in 2 hours. Calculate specific reaction rate. (7M)
Q. 4) A) Justify oxidation and reduction reaction proceed side by side. 8MQ.4 B Write the balanced chemical equation of following reaction. (7M)
Cr2O7 -2 + Fe+2 (aq.) Cr+3 (aq.) + Fe+3 (aq.)
OR
Q. 4) C) Explain the ion-electron method of balancing equations. (8M)
Q. 4) D) What are addition reactions? Explain using suitable examples. (7M)
Q. 5) Write a short note on (any three) (15M)
a) Zeroth law of thermodynamics.
b) Graphical method for determining order of a reaction.
c) Order of reaction.
d) Oxidizing agents.
e) Oxidation number of C in CO2 and S in H2S.
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