Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) B.Sc (Non-Medical) 2020 March Previous Question Papers
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Sc. (Non Medical) (2018 Batch) (Sem.?3)
PHYSICAL CHEMISTRY-II
Subject Code : BSNM-302-18
M.Code : 76901
Time : 3 Hrs. Max. Marks : 50
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying ONE mark
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) What is the relation between C
p
and C
v
of an ideal gas?
b) Consider the following Chemical reaction
Cr
3+
(aq) + 6H
2
O(l) ? ? ? [Cr (H
2
O)
6
]
3+
(aq)
Would this reaction have positive or negative entropy of formation ?
c) What is the equation expressing the change in the Gibbs energy for a reaction
occurring at constant temperature and pressure?
d) State third law of Thermodynamics.
e) Under what condition of ?H and ?S will a change be non-spontaneous regardless of
the temperature?
f) Which of the following processes is ?S positive?
I. 2NO(g) + Cl
2
(g) ? ? 2NOCl (g)
II. NaCl(s) ? ? NaCl (l)
III. 3O
2
(g) ? ? 2O
3
(g)
IV. C
2
H
4
(g) + H
2
(g) ? ? C
2
H
6
(g)
g) Can the pH of a solution have a negative value?
h) What is the criteria of spontaneity for entropy and enthalpy?
i) Define the terms : Phase, Components and degree of freedom.
j) Express phase rule in terms of number of phases (P), components (C) and degrees of
Freedom (F)?
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1 | M-76901 (S105)-799
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Sc. (Non Medical) (2018 Batch) (Sem.?3)
PHYSICAL CHEMISTRY-II
Subject Code : BSNM-302-18
M.Code : 76901
Time : 3 Hrs. Max. Marks : 50
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying ONE mark
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) What is the relation between C
p
and C
v
of an ideal gas?
b) Consider the following Chemical reaction
Cr
3+
(aq) + 6H
2
O(l) ? ? ? [Cr (H
2
O)
6
]
3+
(aq)
Would this reaction have positive or negative entropy of formation ?
c) What is the equation expressing the change in the Gibbs energy for a reaction
occurring at constant temperature and pressure?
d) State third law of Thermodynamics.
e) Under what condition of ?H and ?S will a change be non-spontaneous regardless of
the temperature?
f) Which of the following processes is ?S positive?
I. 2NO(g) + Cl
2
(g) ? ? 2NOCl (g)
II. NaCl(s) ? ? NaCl (l)
III. 3O
2
(g) ? ? 2O
3
(g)
IV. C
2
H
4
(g) + H
2
(g) ? ? C
2
H
6
(g)
g) Can the pH of a solution have a negative value?
h) What is the criteria of spontaneity for entropy and enthalpy?
i) Define the terms : Phase, Components and degree of freedom.
j) Express phase rule in terms of number of phases (P), components (C) and degrees of
Freedom (F)?
2 | M-76901 (S105)-799
SECTION-B
2. a) Derive the expression for molar heat capacities C
v
and C
p
in term of internal energy
change and enthalpy change? (3)
b) Evaluate ?U for 1 mole of oxygen, O
2
going from ?20?C to 37?C at constant volume,
It is an ideal gas with C
v
= 20.78J/mol K. (2)
3. a) Distinguish between reversible and irreversible thermodynamic process. (2.5)
b) Differentiate between extensive and intensive properties with example. (2.5)
4. a) Starting from basic principle derive the relationship (2.5)
?G? = ? RT ln k
p
b) Why ?G? obtained from K
p
and K
c
has different values? When these values will be
same? (2.5)
5. a) Explain the term ?Helmholtz function? and deduce its expression. (2.5)
b) Calculate the change in Helmholtz energy for a reversible isothermal compression of
one mole of ideal gas from 100 L to 10L at298 K. (2.5)
6. a) Show that for a thermodynamically irreversible process (2.5)
?S
system
+ ?S
surrounding
> 0
b) Two ends of a rod are kept at 127?C and 227?C when 2000 Cal of heat flows in this
rod, what will be the change in entropy in J/K? (2.5)
SECTION-C
7. a) State the Phase rule and give its derivations. (5)
b) Draw & discuss the phase diagram of Mg-Zn system. (5)
8. a) Describe ?Carnot Cycle?. Derive an expression for the efficiency of a reversible heat
engine working between temperature T
1
& T
2
(T
2
> T
1
). (6)
b) A heat pump working on Carnot cycle maintains the inside temperature of a house at
22?C by supplying 450 KJ/s. If the outside temperature is 0?C. Calculate the heat
taken in KJ/s from the outside air? (4)
9. What is Nernst Heat Theorem? What result follow from it regarding entropy change and
heat capacity change of system? How it leads to the definition of ?Third law of
Thermodynamics?? (10)
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 02 April 2020