Thermodynamics online test as a assignment | Additional Documents & Tests for IIT JAM PDF Download

 Page 1


 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
Thermodynamics & Thermochemistry Online Test  
(16
th
 Dec, 2016) 
1. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas 
from a volume of 10 dm
3
 to a volume of 100 dm
3
 at 27
0
C is: 
(a) 42.3 J mol
-1
 K
-1 
(b) 38.3 J mol
-1
 K
-1 
(c) 35.8 J mol
-1
 K
-1 
(d) 32.3 J mol
-1
 K
-1 
 
2. For the process, 1 Ar (300 K, 1 bar), ? 1 Ar (200 K, 10 bar) Assuming ideal gas behaviour the 
change in molar entropy is: 
(a) –27.57 J/K/Mole (b) +27.57 J/K/Mole (c) –24.20 J/K/Mole (d) +24.20 J/K/Mole 
 
3. The free energy change (?G) of 1 mole of an ideal gas that is compressed isothermally form 1 
atm to 2 atm is: 
(a) RT ln2  (b) –2RT  (d) –RT ln2  (d) 2RT 
 
4. In conversion of limestone to lime 
CaCO
3
(s) ? CaO(s) + CO
2
(g) the values of ?H
0
 and ?S
0
 are +179.1 kJ mol and 160.2 
JK
-1
 respectively at 298 K and 1 bar. Assuming that ?H
0
 and ?S
0
 do not change with 
temperature, temperature above which conversion of limestone to lime will be 
spontaneous is: 
(a) 1118 K  (b) 1008 K  (c) 1200 K  (d) 845 K 
5. Consider the following reactions:  
 
The heat of formation of CO(g) is: 
(a) –(x + y) kJ/mol (b) (x – y) kJ/mol (c) (y – x) kJ/mol (d) None of these 
6. In thermodynamic, a process is called reversible when: 
(a) Surroundings and system, chang into each other. 
(b) There is no boundary between system and surroundings. 
(c) The surroundings are always in equilibrium with the system. 
(d) The system change into t he surroundings spontaneously. 
Page 2


 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
Thermodynamics & Thermochemistry Online Test  
(16
th
 Dec, 2016) 
1. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas 
from a volume of 10 dm
3
 to a volume of 100 dm
3
 at 27
0
C is: 
(a) 42.3 J mol
-1
 K
-1 
(b) 38.3 J mol
-1
 K
-1 
(c) 35.8 J mol
-1
 K
-1 
(d) 32.3 J mol
-1
 K
-1 
 
2. For the process, 1 Ar (300 K, 1 bar), ? 1 Ar (200 K, 10 bar) Assuming ideal gas behaviour the 
change in molar entropy is: 
(a) –27.57 J/K/Mole (b) +27.57 J/K/Mole (c) –24.20 J/K/Mole (d) +24.20 J/K/Mole 
 
3. The free energy change (?G) of 1 mole of an ideal gas that is compressed isothermally form 1 
atm to 2 atm is: 
(a) RT ln2  (b) –2RT  (d) –RT ln2  (d) 2RT 
 
4. In conversion of limestone to lime 
CaCO
3
(s) ? CaO(s) + CO
2
(g) the values of ?H
0
 and ?S
0
 are +179.1 kJ mol and 160.2 
JK
-1
 respectively at 298 K and 1 bar. Assuming that ?H
0
 and ?S
0
 do not change with 
temperature, temperature above which conversion of limestone to lime will be 
spontaneous is: 
(a) 1118 K  (b) 1008 K  (c) 1200 K  (d) 845 K 
5. Consider the following reactions:  
 
The heat of formation of CO(g) is: 
(a) –(x + y) kJ/mol (b) (x – y) kJ/mol (c) (y – x) kJ/mol (d) None of these 
6. In thermodynamic, a process is called reversible when: 
(a) Surroundings and system, chang into each other. 
(b) There is no boundary between system and surroundings. 
(c) The surroundings are always in equilibrium with the system. 
(d) The system change into t he surroundings spontaneously. 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
7. Which of the following equations represents a reaction that provides the enthalpy of formation 
of CH
3
Cl
2
: 
(a)  (b)  
(c)  (d)  
 
8. For 1 mole of a monoatomic ideal gas, the relation between pressure (P), volume (V) and 
average molecular kinetic energy is: 
(a)   (b)   (c)   (d)  
 
9. If enthalpy of hydrogenation of C
6
H
6(l)
 into C
6
H
12(l)
 is –205 kJ and resonance energy of C
6
H
6(l)
 is –
152 kJ/mol then enthalpy of hydrogenation of is assume ?H
Vap
 of C
6
H
6(l)
, C
6
H
8(l)
, C
6
H
12(l)
 
all are equal: 
(a) –535.5 kJ/mol (b) –238 kJ/mol  (c) – 357 kJ/mol  (d) –119 kJ/mol 
 
10.  The standard free energies of formation of H
2
S
(g)
 and CdS
(s)
 at 1000°C are –49.0 kJ/mol and –
127.2 kJ/mol respectively. Use these date to predict whether H
2(g)
 will reduce CdS
(s)
 to metallic 
Cd at this temperature: 
(a) ?G = –78.2 kJ/mol and H
2
 reduces CdS   
 (b) ?G = –39.1 kJ/mol and H
2
 reduces CdS 
(c) ?G = 0 kJ/mol and reaction is at equilibrium.  
(d) ?G = 78.2 kJ/mol and the reaction is not feasible. 
 
11. if ?
f
 H
0
 (C
2
H
4
) and ?
f
 H
0
 (C
2
H
6
) are x
1
 and x
2
 kcal mol
-1, 
then heat of hydrogenation of C
2
H
4
 is : 
(a) x
1
 + x
2  
(b)
 
x
1
 - x
2  
(c) x
2
 - x
1  
(d) x
1
 + 2x
2 
 
12. A monoatomic ideal gas undergoes a process in which the ratio of p to V at any instant is 
constant and equal to 1. What is the molar heat capacity of the gas: 
(a)   (b)   (c)   (d) 0 
 
13. The internal pressure of a Vander Wall’s gas is: 
(a) Independent of the molar volume.       
(b) Inversely proportional to the molar volume.  
Page 3


 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
Thermodynamics & Thermochemistry Online Test  
(16
th
 Dec, 2016) 
1. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas 
from a volume of 10 dm
3
 to a volume of 100 dm
3
 at 27
0
C is: 
(a) 42.3 J mol
-1
 K
-1 
(b) 38.3 J mol
-1
 K
-1 
(c) 35.8 J mol
-1
 K
-1 
(d) 32.3 J mol
-1
 K
-1 
 
2. For the process, 1 Ar (300 K, 1 bar), ? 1 Ar (200 K, 10 bar) Assuming ideal gas behaviour the 
change in molar entropy is: 
(a) –27.57 J/K/Mole (b) +27.57 J/K/Mole (c) –24.20 J/K/Mole (d) +24.20 J/K/Mole 
 
3. The free energy change (?G) of 1 mole of an ideal gas that is compressed isothermally form 1 
atm to 2 atm is: 
(a) RT ln2  (b) –2RT  (d) –RT ln2  (d) 2RT 
 
4. In conversion of limestone to lime 
CaCO
3
(s) ? CaO(s) + CO
2
(g) the values of ?H
0
 and ?S
0
 are +179.1 kJ mol and 160.2 
JK
-1
 respectively at 298 K and 1 bar. Assuming that ?H
0
 and ?S
0
 do not change with 
temperature, temperature above which conversion of limestone to lime will be 
spontaneous is: 
(a) 1118 K  (b) 1008 K  (c) 1200 K  (d) 845 K 
5. Consider the following reactions:  
 
The heat of formation of CO(g) is: 
(a) –(x + y) kJ/mol (b) (x – y) kJ/mol (c) (y – x) kJ/mol (d) None of these 
6. In thermodynamic, a process is called reversible when: 
(a) Surroundings and system, chang into each other. 
(b) There is no boundary between system and surroundings. 
(c) The surroundings are always in equilibrium with the system. 
(d) The system change into t he surroundings spontaneously. 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
7. Which of the following equations represents a reaction that provides the enthalpy of formation 
of CH
3
Cl
2
: 
(a)  (b)  
(c)  (d)  
 
8. For 1 mole of a monoatomic ideal gas, the relation between pressure (P), volume (V) and 
average molecular kinetic energy is: 
(a)   (b)   (c)   (d)  
 
9. If enthalpy of hydrogenation of C
6
H
6(l)
 into C
6
H
12(l)
 is –205 kJ and resonance energy of C
6
H
6(l)
 is –
152 kJ/mol then enthalpy of hydrogenation of is assume ?H
Vap
 of C
6
H
6(l)
, C
6
H
8(l)
, C
6
H
12(l)
 
all are equal: 
(a) –535.5 kJ/mol (b) –238 kJ/mol  (c) – 357 kJ/mol  (d) –119 kJ/mol 
 
10.  The standard free energies of formation of H
2
S
(g)
 and CdS
(s)
 at 1000°C are –49.0 kJ/mol and –
127.2 kJ/mol respectively. Use these date to predict whether H
2(g)
 will reduce CdS
(s)
 to metallic 
Cd at this temperature: 
(a) ?G = –78.2 kJ/mol and H
2
 reduces CdS   
 (b) ?G = –39.1 kJ/mol and H
2
 reduces CdS 
(c) ?G = 0 kJ/mol and reaction is at equilibrium.  
(d) ?G = 78.2 kJ/mol and the reaction is not feasible. 
 
11. if ?
f
 H
0
 (C
2
H
4
) and ?
f
 H
0
 (C
2
H
6
) are x
1
 and x
2
 kcal mol
-1, 
then heat of hydrogenation of C
2
H
4
 is : 
(a) x
1
 + x
2  
(b)
 
x
1
 - x
2  
(c) x
2
 - x
1  
(d) x
1
 + 2x
2 
 
12. A monoatomic ideal gas undergoes a process in which the ratio of p to V at any instant is 
constant and equal to 1. What is the molar heat capacity of the gas: 
(a)   (b)   (c)   (d) 0 
 
13. The internal pressure of a Vander Wall’s gas is: 
(a) Independent of the molar volume.       
(b) Inversely proportional to the molar volume.  
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
(c) Inversely proportional to square of the molar volume. 
(d) Directly proportional to the molar volume. 
 
14. During the isothermal free expansion process the entropy of the surrounding & System 
respectively: 
(a)   (b)  (c) 0; 0    (d)  
15. Consider the following data : B.E 
(N-H) = 393 kJ/mol and B.E (H-H) = 436 Kj/mol , The N–
N bond energy in N
2
H
4
 is: 
(a) 226 kJ/mol  (b) 154 kJ/mol           (c) 190 kJ/mol  (d) None of these 
16. Among the following, intensive property is/are: 
(a) Molar conductivity     (b)Electromotive force (c) Resistance  (d) Heat capacity 
 
17. One mole of monoatomic ideal gas initially at a pressure of 2.0 bar and tamperture of 300 K is 
taken to a final pressure of 4.00 bar by a reversible path define by P/V = constant. Taking C
V
 to 
be equal to 12.5 J mol
-1
K
-1
. The correct deduction for this process is/are: 
(a) Final T = 1116 K (b) E = 10.2 kJ  (c) W
sym
 = –1.7 kJ (d) Q
sys
 = 6.8 kJ 
 
18. Select the correct conditions indicated below the following plots: 
(a)  (b) (c) (d) 
19. The given graph represent the variations of Z Vs P, for the real gases A, B and C identify 
the only incorrect statement:  
 
Page 4


 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
Thermodynamics & Thermochemistry Online Test  
(16
th
 Dec, 2016) 
1. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas 
from a volume of 10 dm
3
 to a volume of 100 dm
3
 at 27
0
C is: 
(a) 42.3 J mol
-1
 K
-1 
(b) 38.3 J mol
-1
 K
-1 
(c) 35.8 J mol
-1
 K
-1 
(d) 32.3 J mol
-1
 K
-1 
 
2. For the process, 1 Ar (300 K, 1 bar), ? 1 Ar (200 K, 10 bar) Assuming ideal gas behaviour the 
change in molar entropy is: 
(a) –27.57 J/K/Mole (b) +27.57 J/K/Mole (c) –24.20 J/K/Mole (d) +24.20 J/K/Mole 
 
3. The free energy change (?G) of 1 mole of an ideal gas that is compressed isothermally form 1 
atm to 2 atm is: 
(a) RT ln2  (b) –2RT  (d) –RT ln2  (d) 2RT 
 
4. In conversion of limestone to lime 
CaCO
3
(s) ? CaO(s) + CO
2
(g) the values of ?H
0
 and ?S
0
 are +179.1 kJ mol and 160.2 
JK
-1
 respectively at 298 K and 1 bar. Assuming that ?H
0
 and ?S
0
 do not change with 
temperature, temperature above which conversion of limestone to lime will be 
spontaneous is: 
(a) 1118 K  (b) 1008 K  (c) 1200 K  (d) 845 K 
5. Consider the following reactions:  
 
The heat of formation of CO(g) is: 
(a) –(x + y) kJ/mol (b) (x – y) kJ/mol (c) (y – x) kJ/mol (d) None of these 
6. In thermodynamic, a process is called reversible when: 
(a) Surroundings and system, chang into each other. 
(b) There is no boundary between system and surroundings. 
(c) The surroundings are always in equilibrium with the system. 
(d) The system change into t he surroundings spontaneously. 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
7. Which of the following equations represents a reaction that provides the enthalpy of formation 
of CH
3
Cl
2
: 
(a)  (b)  
(c)  (d)  
 
8. For 1 mole of a monoatomic ideal gas, the relation between pressure (P), volume (V) and 
average molecular kinetic energy is: 
(a)   (b)   (c)   (d)  
 
9. If enthalpy of hydrogenation of C
6
H
6(l)
 into C
6
H
12(l)
 is –205 kJ and resonance energy of C
6
H
6(l)
 is –
152 kJ/mol then enthalpy of hydrogenation of is assume ?H
Vap
 of C
6
H
6(l)
, C
6
H
8(l)
, C
6
H
12(l)
 
all are equal: 
(a) –535.5 kJ/mol (b) –238 kJ/mol  (c) – 357 kJ/mol  (d) –119 kJ/mol 
 
10.  The standard free energies of formation of H
2
S
(g)
 and CdS
(s)
 at 1000°C are –49.0 kJ/mol and –
127.2 kJ/mol respectively. Use these date to predict whether H
2(g)
 will reduce CdS
(s)
 to metallic 
Cd at this temperature: 
(a) ?G = –78.2 kJ/mol and H
2
 reduces CdS   
 (b) ?G = –39.1 kJ/mol and H
2
 reduces CdS 
(c) ?G = 0 kJ/mol and reaction is at equilibrium.  
(d) ?G = 78.2 kJ/mol and the reaction is not feasible. 
 
11. if ?
f
 H
0
 (C
2
H
4
) and ?
f
 H
0
 (C
2
H
6
) are x
1
 and x
2
 kcal mol
-1, 
then heat of hydrogenation of C
2
H
4
 is : 
(a) x
1
 + x
2  
(b)
 
x
1
 - x
2  
(c) x
2
 - x
1  
(d) x
1
 + 2x
2 
 
12. A monoatomic ideal gas undergoes a process in which the ratio of p to V at any instant is 
constant and equal to 1. What is the molar heat capacity of the gas: 
(a)   (b)   (c)   (d) 0 
 
13. The internal pressure of a Vander Wall’s gas is: 
(a) Independent of the molar volume.       
(b) Inversely proportional to the molar volume.  
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
(c) Inversely proportional to square of the molar volume. 
(d) Directly proportional to the molar volume. 
 
14. During the isothermal free expansion process the entropy of the surrounding & System 
respectively: 
(a)   (b)  (c) 0; 0    (d)  
15. Consider the following data : B.E 
(N-H) = 393 kJ/mol and B.E (H-H) = 436 Kj/mol , The N–
N bond energy in N
2
H
4
 is: 
(a) 226 kJ/mol  (b) 154 kJ/mol           (c) 190 kJ/mol  (d) None of these 
16. Among the following, intensive property is/are: 
(a) Molar conductivity     (b)Electromotive force (c) Resistance  (d) Heat capacity 
 
17. One mole of monoatomic ideal gas initially at a pressure of 2.0 bar and tamperture of 300 K is 
taken to a final pressure of 4.00 bar by a reversible path define by P/V = constant. Taking C
V
 to 
be equal to 12.5 J mol
-1
K
-1
. The correct deduction for this process is/are: 
(a) Final T = 1116 K (b) E = 10.2 kJ  (c) W
sym
 = –1.7 kJ (d) Q
sys
 = 6.8 kJ 
 
18. Select the correct conditions indicated below the following plots: 
(a)  (b) (c) (d) 
19. The given graph represent the variations of Z Vs P, for the real gases A, B and C identify 
the only incorrect statement:  
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
(a) For the gas A, a = 0 and its dependence on P is linear at all pressure. 
(b) For the gas B, b = 0 and its dependence on P is linear at all pressure. 
(c) For the gas C, which is topical real gas for which neigher a nor b = 0 by knowing the 
minima and the point of interaction with Z = 1, a & b can be calculated. 
(d) At high pressure, the slope is positive for all real gases. 
20. One mole of an ideal gas is subjected to a step reversible process (A - B and B - C ). The k 
pressure at A and C is same. Mark the correct statement(s): 
(a) Work involved in the path AB is zero   
(b) In the path AB  work will be done on the gas the surrounding 
(c) Volume of gas at C = 3×volume of gas at A 
(d) Volume of gas at B is 16.42 liters 
 
21. A sample of gas is compressed at a pressure of 0.5 atmosphere form a volume of 40 mL to 200 
mL. During the process 8.0 Joules of heat flows to the surrounding. Calculate the change in 
internal energy of the system. 
 
22. Given that standard molar enthalpies of formation of NO
(g)
 and NO
2(g)
 are respectively 
90.3 kJ/mole and 33.2 kJ/mol, the enthalpy change for the reaction, 
is (in kJ) 
23. How many grams of oxygen are contained in 10.5 L of oxygen measured over water at 25
0
C and 
740 torr? Vapor pressure of water at 25
0
C is 24 torr. 
 
24. The coefficient of cubic expansion a and the isothermal compressibility ß for metallic copper at 
25
0
C have value 49.2×10
-6
 K
-1
 and 7.747×10
-6
 MPa
-1
, respectively. Density of Cu at 25
0
C is 8.93 g 
cm
-3
. Calculate C
p
–C
v
 per mole for Cu. 
 
25. 0.35 mol of an ideal monoatomic gas is expanded adiabatically from a volume of 1 dm
3
 at 400 K 
to a volume of 5 dm
3
 against a constant external pressure of 50.65 KPa. What is the final 
temperature of the gas (in K). 
 
26. A 2L vessel containing 2g of H
2
 gas at 27°C is connected to a 2L vessel containing 176 g of CO
2
 
gas at 27°C. Assuming ideal behaviour of H
2
 and CO
2
, the particle pressure of H
2
 at equilibrium is 
………………….bar: 
Page 5


 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
Thermodynamics & Thermochemistry Online Test  
(16
th
 Dec, 2016) 
1. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas 
from a volume of 10 dm
3
 to a volume of 100 dm
3
 at 27
0
C is: 
(a) 42.3 J mol
-1
 K
-1 
(b) 38.3 J mol
-1
 K
-1 
(c) 35.8 J mol
-1
 K
-1 
(d) 32.3 J mol
-1
 K
-1 
 
2. For the process, 1 Ar (300 K, 1 bar), ? 1 Ar (200 K, 10 bar) Assuming ideal gas behaviour the 
change in molar entropy is: 
(a) –27.57 J/K/Mole (b) +27.57 J/K/Mole (c) –24.20 J/K/Mole (d) +24.20 J/K/Mole 
 
3. The free energy change (?G) of 1 mole of an ideal gas that is compressed isothermally form 1 
atm to 2 atm is: 
(a) RT ln2  (b) –2RT  (d) –RT ln2  (d) 2RT 
 
4. In conversion of limestone to lime 
CaCO
3
(s) ? CaO(s) + CO
2
(g) the values of ?H
0
 and ?S
0
 are +179.1 kJ mol and 160.2 
JK
-1
 respectively at 298 K and 1 bar. Assuming that ?H
0
 and ?S
0
 do not change with 
temperature, temperature above which conversion of limestone to lime will be 
spontaneous is: 
(a) 1118 K  (b) 1008 K  (c) 1200 K  (d) 845 K 
5. Consider the following reactions:  
 
The heat of formation of CO(g) is: 
(a) –(x + y) kJ/mol (b) (x – y) kJ/mol (c) (y – x) kJ/mol (d) None of these 
6. In thermodynamic, a process is called reversible when: 
(a) Surroundings and system, chang into each other. 
(b) There is no boundary between system and surroundings. 
(c) The surroundings are always in equilibrium with the system. 
(d) The system change into t he surroundings spontaneously. 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com 
7. Which of the following equations represents a reaction that provides the enthalpy of formation 
of CH
3
Cl
2
: 
(a)  (b)  
(c)  (d)  
 
8. For 1 mole of a monoatomic ideal gas, the relation between pressure (P), volume (V) and 
average molecular kinetic energy is: 
(a)   (b)   (c)   (d)  
 
9. If enthalpy of hydrogenation of C
6
H
6(l)
 into C
6
H
12(l)
 is –205 kJ and resonance energy of C
6
H
6(l)
 is –
152 kJ/mol then enthalpy of hydrogenation of is assume ?H
Vap
 of C
6
H
6(l)
, C
6
H
8(l)
, C
6
H
12(l)
 
all are equal: 
(a) –535.5 kJ/mol (b) –238 kJ/mol  (c) – 357 kJ/mol  (d) –119 kJ/mol 
 
10.  The standard free energies of formation of H
2
S
(g)
 and CdS
(s)
 at 1000°C are –49.0 kJ/mol and –
127.2 kJ/mol respectively. Use these date to predict whether H
2(g)
 will reduce CdS
(s)
 to metallic 
Cd at this temperature: 
(a) ?G = –78.2 kJ/mol and H
2
 reduces CdS   
 (b) ?G = –39.1 kJ/mol and H
2
 reduces CdS 
(c) ?G = 0 kJ/mol and reaction is at equilibrium.  
(d) ?G = 78.2 kJ/mol and the reaction is not feasible. 
 
11. if ?
f
 H
0
 (C
2
H
4
) and ?
f
 H
0
 (C
2
H
6
) are x
1
 and x
2
 kcal mol
-1, 
then heat of hydrogenation of C
2
H
4
 is : 
(a) x
1
 + x
2  
(b)
 
x
1
 - x
2  
(c) x
2
 - x
1  
(d) x
1
 + 2x
2 
 
12. A monoatomic ideal gas undergoes a process in which the ratio of p to V at any instant is 
constant and equal to 1. What is the molar heat capacity of the gas: 
(a)   (b)   (c)   (d) 0 
 
13. The internal pressure of a Vander Wall’s gas is: 
(a) Independent of the molar volume.       
(b) Inversely proportional to the molar volume.  
 
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(c) Inversely proportional to square of the molar volume. 
(d) Directly proportional to the molar volume. 
 
14. During the isothermal free expansion process the entropy of the surrounding & System 
respectively: 
(a)   (b)  (c) 0; 0    (d)  
15. Consider the following data : B.E 
(N-H) = 393 kJ/mol and B.E (H-H) = 436 Kj/mol , The N–
N bond energy in N
2
H
4
 is: 
(a) 226 kJ/mol  (b) 154 kJ/mol           (c) 190 kJ/mol  (d) None of these 
16. Among the following, intensive property is/are: 
(a) Molar conductivity     (b)Electromotive force (c) Resistance  (d) Heat capacity 
 
17. One mole of monoatomic ideal gas initially at a pressure of 2.0 bar and tamperture of 300 K is 
taken to a final pressure of 4.00 bar by a reversible path define by P/V = constant. Taking C
V
 to 
be equal to 12.5 J mol
-1
K
-1
. The correct deduction for this process is/are: 
(a) Final T = 1116 K (b) E = 10.2 kJ  (c) W
sym
 = –1.7 kJ (d) Q
sys
 = 6.8 kJ 
 
18. Select the correct conditions indicated below the following plots: 
(a)  (b) (c) (d) 
19. The given graph represent the variations of Z Vs P, for the real gases A, B and C identify 
the only incorrect statement:  
 
 
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(a) For the gas A, a = 0 and its dependence on P is linear at all pressure. 
(b) For the gas B, b = 0 and its dependence on P is linear at all pressure. 
(c) For the gas C, which is topical real gas for which neigher a nor b = 0 by knowing the 
minima and the point of interaction with Z = 1, a & b can be calculated. 
(d) At high pressure, the slope is positive for all real gases. 
20. One mole of an ideal gas is subjected to a step reversible process (A - B and B - C ). The k 
pressure at A and C is same. Mark the correct statement(s): 
(a) Work involved in the path AB is zero   
(b) In the path AB  work will be done on the gas the surrounding 
(c) Volume of gas at C = 3×volume of gas at A 
(d) Volume of gas at B is 16.42 liters 
 
21. A sample of gas is compressed at a pressure of 0.5 atmosphere form a volume of 40 mL to 200 
mL. During the process 8.0 Joules of heat flows to the surrounding. Calculate the change in 
internal energy of the system. 
 
22. Given that standard molar enthalpies of formation of NO
(g)
 and NO
2(g)
 are respectively 
90.3 kJ/mole and 33.2 kJ/mol, the enthalpy change for the reaction, 
is (in kJ) 
23. How many grams of oxygen are contained in 10.5 L of oxygen measured over water at 25
0
C and 
740 torr? Vapor pressure of water at 25
0
C is 24 torr. 
 
24. The coefficient of cubic expansion a and the isothermal compressibility ß for metallic copper at 
25
0
C have value 49.2×10
-6
 K
-1
 and 7.747×10
-6
 MPa
-1
, respectively. Density of Cu at 25
0
C is 8.93 g 
cm
-3
. Calculate C
p
–C
v
 per mole for Cu. 
 
25. 0.35 mol of an ideal monoatomic gas is expanded adiabatically from a volume of 1 dm
3
 at 400 K 
to a volume of 5 dm
3
 against a constant external pressure of 50.65 KPa. What is the final 
temperature of the gas (in K). 
 
26. A 2L vessel containing 2g of H
2
 gas at 27°C is connected to a 2L vessel containing 176 g of CO
2
 
gas at 27°C. Assuming ideal behaviour of H
2
 and CO
2
, the particle pressure of H
2
 at equilibrium is 
………………….bar: 
 
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27. 2 mole of an ideal gas expanded isothermally and reversibly form 1L to 10L at 300 K. What is the 
enthalpy change: 
 
28. 50 ml of a gas A diffuse through a membrane in the same time as for the diffusion of 40 ml of 
gas B under identical condition of pressure and temperature. If the molecular mass of A is 64 
that of B would be: 
 
29. 36 ml of pure water takes 100 sec to evaporate from a vessel and heater connected to an 
electric source. which delivers 806 watt. The ?H
vap
 
 of H
2
o is (in k j /mole) 
 
30. 0.5 mole each of two ideal gases A and B are taken in a container 
and expanded reversibly and adiabatically, during this process temp of gaseous mixture 
decreased from 350 K to 250 K find ?H (in cal/mol) for the process: 
 
Answer Key 
 
1.   b 2.  a 3.  a 4.  a 5.  c 
6.  c 7.  c 8.  c 9.  b 10.  d 
11.  c 12.  a 13.  c 14.  a 15.  c 
16.  a,b 17.  a,b,c 18.  a,c,d 19.  b 20.  a,c,d 
21.  16 to 17  22.  -115 to -114 23.  12.5 to 13.5 24.  0.65 to 0.68 25.  350 to 355 
26.  6.00 to 6.50 27.  0 28.  100 29.  40 to 45 30.  -376 to -374