The First Law of Thermodynamics (Concept of Work, Heat Internal Energy and Enthalpy, Heat Capacity,...) NEET Questions

Physical Chemistry - Chemical Thermodynamics

The First Law of Thermodynamics (Concept of Work, Heat Internal Energy and Enthalpy, Heat Capacity,...) MCQ Questions


13.
The heat required to break a chemical bond is called
A.
Heat of formation
B.
Bond enthalpy
C.
Heat of combustion
D.
Heat of hydration
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ANSWER :
B. Bond enthalpy
14.
When a gas expands adiabatically, its temperature
A.
Decreases
B.
Increases
C.
Remains constant
D.
Depends on volume change
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ANSWER :
A. Decreases
15.
Which process has q = 0?
A.
Isobaric
B.
Isothermal
C.
Adiabatic
D.
Isochoric
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ANSWER :
C. Adiabatic
16.
Which enthalpy change is always exothermic?
A.
Formation
B.
Combustion
C.
Atomization
D.
Sublimation
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ANSWER :
B. Combustion
17.
In an adiabatic process, the work done is equal to
A.
Heat absorbed
B.
Internal energy change
C.
Entropy change
D.
Free energy change
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ANSWER :
B. Internal energy change
18.
The enthalpy of a solution is defined as
A.
Heat absorbed when solute dissolves in solvent
B.
Heat released in combustion
C.
Heat absorbed during fusion
D.
Heat change during reaction in a bomb calorimeter
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ANSWER :
A. Heat absorbed when solute dissolves in solvent