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Class 11 Chemistry
Thermodynamics
Quiz 1
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Third law of thermodynamics provides a method to evaluate which property?
0%
Absolute Energy
0%
Absolute Enthalpy
0%
Absolute Entropy
0%
Absolute Free Energy
Explanation
Absolute Entropy
One mole of which of the following has the highest entropy?
0%
Liquid Nitrogen
0%
Hydrogen Gas
0%
Mercury
0%
Diamond
Explanation
Hydrogen Gas
The enthalpy of vaporisation of a substance is 8400 J mol
0%
84 J mol
0%
21 J mol
0%
49 J mol
0%
12 J mol
Explanation
84 J mol
The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
0%
Br
0%
Cl
0%
H
0%
CH
Explanation
Cl
In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?
0%
850 kJ
0%
600 kJ
0%
350 kJ
0%
250 kJ
Explanation
350 kJ
Which of the following is true for the reaction? H
0%
∆S = 0
0%
∆H = T ∆S
0%
∆H = ∆U
0%
∆H = 0
Explanation
∆S = 0
Calculate the heat required to make 6.4 Kg CaC2 from CaO(s) and C(s) from the reaction: CaO(s) + 3 C(s) → CaC
2
(s) + CO (g) given that ∆
f
Ho (CaC
2
) = -14.2 kcal. ∆
f
H° (CO) = -26.4 kcal.
0%
5624 kcal
0%
1.11 × 10
4
kcal
0%
86.24 × 10³
0%
1100 kcal
Explanation
(b) 1.11 × 10
4
kcal
Explanation: n = (Mass)/ (Molecular weight) = (6.4 × 10³)/ (64) = 100 For 1 mole of CaC
2
∆ H = ∆H
f
(CaC) + H
f
(CO) – H
f
(CaO) = -14.2 – 26.4 + 151.6 = 111.1 kcal For 100 moles, ∆H = 1.11 × 10
4
Kcal
In a system where ∆E = -0 kJ, a piston expanded against a p
0%
-36 kJ
0%
-13 kJ
0%
-47 kJ
0%
24 kJ
Explanation
-47 kJ
A system absorb 10 kJ of heat at constant volume and its temperature rises from 270 C to 370 C. The value of ∆ U is
0%
100 kJ
0%
10 kJ
0%
0 kJ
0%
1 kJ
Explanation
10 kJ
An ideal gas is taken around the cycle ABCA as shown in P-V diagram The next work done by the gas during the cycle is equal to:
0%
12P
0%
6P
0%
5P
0%
P
Explanation
5P
In which of the following process, a maximum increase in entropy is observed?
0%
Dissolution of Salt in Water
0%
Condensation of Water
0%
Sublimation of Naphthalene
0%
Melting of Ice
Explanation
Sublimation of Naphthalene
The bond energy (in kcal mol
0%
1
0%
10
0%
83-85
0%
1000
Explanation
83-85
Which thermodynamic function accounts automatically for enthalpy and entropy both?
0%
Helmholtz Free Energy (A)
0%
Internal Energy (E)
0%
Work Function
0%
Gibbs Free Energy
Explanation
Gibbs Free Energy
The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283.0 kJ mol
-1
respectively. The enthalpy of formation of carbon monoxide is:
0%
-676 kJ
0%
110.5 kJ
0%
-110.5 kJ
0%
676.5 kJ
Explanation
(c) -110.5 kJ
Explanation:
C(s) + O
2
a CO
2
∆H
1
= -393.5
CO + (1/2) O
2
a CO
2
∆H
2
= -283.0
C(s) + (1/2) O
2
a CO ∆H = ∆H
1
- ∆H
2
= -393.5 + 283 = -110.5 KJ
The enthalpy of formation of carbon monoxide is:
0%
-676 kJ
0%
110. 5 kJ
0%
-110. 5 kJ
0%
676. 5 kJ
Explanation
-110. 5 kJ
The amount of the heat released when 20 ml5 M NaOH is mixed with 100 ml1 M HCl is x kJ. The heat of neutralization is
0%
-100 × kJ/mol
0%
-50 × kJ/mol
0%
100 × KJ/mol
0%
50 × kJ/mol
Explanation
-100 × kJ/mol
Based on the first law of thermodynamics, which one of the following is correct?
0%
For an isothermal process, q = +w
0%
For an isochoric process, ΔU = -q
0%
For an adiabatic process, ΔU = -w
0%
For a cyclic process, q = -w
Explanation
For a cyclic process, q = -w
A system absorb 10 kJ of heat at constant volume and its temperature rises from 270°C to 370°C. The value of ∆ U is
0%
100 kJ
0%
10 kJ
0%
0 kJ
0%
1 kJ
Explanation
10 kJ
The temperature of the system decreases in an ______.
0%
Adiabatic Compression
0%
Isothermal Expansion
0%
Isothermal Compression
0%
Adiabatic Expansion
Explanation
Adiabatic Expansion
Which of the following salts will have maximum cooling effect when5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt?
0%
KNO
0%
NaCl (∆H = 5. 35 kJ mol
0%
HBr (∆H = -83. 3 kJ mol
0%
KOH ( ∆H = -55. 6 kJ mol
Explanation
KNO
0 h : 0 m : 1 s
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