This set of Physical Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Basic Chemistry”.
1. Chemical Thermodynamics is the study of how heat and work relate to each other both in changes of state and in chemical reactions.
a) True
b) False
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Explanation: Chemical thermodynamics is the study of how heat and work relate to each other both in changes of state and in chemical reactions. It involves a series of rules and laws that explain how heat and work well, work, and explains which processes can happen spontaneously and which need some help.
2. What is an isolated system?
a) let energy pass in and out of the system, but that don’t allow mass to enter or escape
b) allows both energy and matter to enter and leave
c) doesn’t allow the transfer of energy or mass
d) only allow mass
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Explanation: An isolated system is one that has rigid walls and doesn’t allow the transfer of energy or mass.
3. What is heat?
a) thermal energy transferred from a hotter system to a cooler system that is in contact
b) defined in science as the ability to do work
c) energy contained within the system, excluding the kinetic energy of the motion as a whole
d) a measure of thermal energy per unit temperature
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Explanation: Heat is the thermal energy transferred from a hotter system to a cooler system that are in contact. It is denoted by q.
4. What is the unit of Specific Heat Capacity?
a) Joule / (grams. K)
b) Joule / K
c) Joule / (mole. K)
d) Joule / kg
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Explanation: Specific Heat Capacity, represented by symbol C or c, is how much energy is needed to increase the temperature of one gram of a substance by 1 degree centigrade or 1 K.
5. To calculate the work done by a constant force, we can use the following equation:
a) work = force × heat
b) work = displacement × heat
c) work = force / displacement
d) work = force × displacement
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Explanation: Work is done when a force is applied to an object and the object is moved through a distance.
6. The spontaneity of the process depend upon __________
a) temperature
b) pressure
c) heat
d) energy
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Explanation: Phase transitions, will proceed spontaneously in one direction or the other depending upon the temperature of the substance. Likewise, some chemical reactions can also exhibit temperature dependent spontaneities.
7. In an isothermal process __________
a) there is no change in pressure
b) there is change in internal energy
c) there is no change in temperature
d) there is change in enthalpy
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Explanation: An isothermal process is a change of system, in which the temperature remains constant. This occurs when a system is in contact with an outside thermal reservoir, and the change will occur slowly enough to allow the system to continually adjust to the temperature through the heat exchange.
8. The compression ratio for Diesel engines is __________
a) 15 to 20
b) 30 to 40
c) 50 to 60
d) 20 to 30
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Explanation: In the diesel engine, air is compressed at a ratio of 15 and 20. This compression raises the temperature to the ignition temperature of the fuel mixture which is formed by injecting fuel once the air is compressed.
9. The measurement of the thermodynamic property known as temperature based on __________
a) third law of thermodynamics
b) first law of thermodynamics
c) zeroth law of thermodynamics
d) second law of thermodynamics
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Explanation: When two bodies are separately in thermal equilibrium with a third body, then the two bodies are also in thermal equilibrium.
10. The efficiency of diesel cycle depends upon __________
a) compression ratio
b) pressure ratio
c) temperature limits
d) cut- off ratio and compression ratio
View Answer
Explanation: Cut-off ratio basically tells us the position of piston where fuel addition is stopped or cut off.
Sanfoundry Global Education & Learning Series – Physical Chemistry.
To practice all areas of Physical Chemistry, here is complete set of Multiple Choice Questions and Answers.
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