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WorksheetsCHEMICAL THERMODYNAMICS
Total questions: 20
Worksheet time: 15mins
Which of the following property cannot be used to describe state of a system?
Pressure
Volume
Temperature
Universal Gas Constant
The system that does not allow the heat to pass through its boundary between the system and surrounding is called as............ System.
Adiabatic
Open
Isothermal
Closed
An open system allows the transfer of
Only mass
Only Energy
Both mass and energy
Neither mass nor energy
One mole of which of the following has the highest entropy?
Liquid nitrogen
Hydrogen gas
Mercury
Diamond
The Enthalpy of vaporisation of a substance is 8400J/mol and it's boiling pt. is -173°C.The entropy change for vaporisation is:
84J/mol/K
21J/mol/K
49J/K/mol
12 J/K/mol
A system absorb 10kJ of heat at constant volume and it's temp. rises from 270°C to 370°C.The value of ∆U is
100 kJ
10kJ
0 kJ
1 kJ
In which of the following process a maximum increase in entropy is observed?
Dissolution of salt in water
Condensation of water
Sublimation of naphthalene
Melting of ice
Based on the 1st law of thermodynamics, which one of the following is correct?
For an isothermal process, q=+w
For an isochoric process ∆U=-q
For an adiabatic process, ∆U= -W
For cyclic process, q= -W
For the reaction C(s)+O2(g)→CO2(g)
∆H>∆U
∆H<∆U
∆H=∆U
None of these
For an ideal gas, Cv and Cp are related as:
Cv-Cp = R
Cv+Cp=R
Cp-Cv=RT
Cp-Cv=R
Considering entropy(S) thermodynamic parameters the criteria for the spontaneity of any process is:
∆Ssystem+∆Ssurr >0
∆Ssystem-∆Ssurr<0
∆Ssystem>0
∆Ssurr>0
Work done in case of isothermal free expansion
Maximum
Zero
Minimum
Negative
The enthalpies of all elements in their standard states are equal to
Unity
Different for each element
Zero
<0
Enthalpy of sublimation is =
Enthalpy of fusion+Enthalpy of vaporisation
Enthalpy of fusion
Enthalpy of Vaporisation
Twice the enthalpy of vaporisation
If the volume of a gas is reduced to half of its initial volume then the specific heat will be
Reduced to half
Doubled
Remains constant
Increase four times
Which of the following is an extensive property?
Molar heat capacity
Temperature
Enthalpy
All of these
............. Is a quantity that represent total energy of the system.
Enthalpy
Internal energy
Chemical energy
Bond energy
The equation N2+O2→2NO, ∆H=180kJ/mol represent (a) Reaction
Hess's law is also known as
Law of conservation of mass
Law of conservation of energy
Law of mass action
None of these
A system which contains single phase is called
Heterogenous
Homogenous
Isolated
All of these
