Chemistry Quiz Conducted By Dept Of Chemistry, Mrs. K.S.K. College, Beed
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A well stoppered thermos flask contains some ice cubes. This is an example of a
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Closed system
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Open system
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Isolated system
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Non-thermodynamic system
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Chemistry Quiz conducted by Dept of Chemistry, Mrs. K. S. K. College, Beed.
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- 2.
Identify the intensive quantity from the following
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Enthalpy and temperature
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Volume and temperature
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Enthalpy and volume
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Temperature and refractive index
Correct Answer
A. Temperature and refractive indexExplanation
The intensive quantity is a physical property that does not depend on the amount of substance present. In this case, temperature and refractive index are the only options that fit this definition. Enthalpy and volume are extensive quantities that depend on the amount of substance, while temperature and refractive index are intensive quantities that remain constant regardless of the amount of substance.Rate this question:
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- 3.
The temperature of the system decreases in an
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Adiabatic compression
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Isothermal compression
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Isothermal expansion
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Adiabatic expansion
Correct Answer
A. Adiabatic expansionExplanation
In adiabatic expansion, the system undergoes expansion without any heat exchange with the surroundings. This means that no heat is added or removed from the system during the expansion process. As a result, the temperature of the system decreases. This is because the expansion causes the internal energy of the system to decrease, which in turn leads to a decrease in temperature. Therefore, the correct answer is adiabatic expansion.Rate this question:
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- 4.
For the isothermal expansion of an ideal gas
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E and H increases
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E increases but H decreases
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H increases but E decreases
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E and H are unaltered
Correct Answer
A. E and H are unalteredExplanation
During an isothermal expansion of an ideal gas, the temperature remains constant. Since both E (internal energy) and H (enthalpy) are directly proportional to temperature, and the temperature does not change in an isothermal process, both E and H will remain unaltered. This means that the internal energy and enthalpy of the gas will not increase or decrease during the expansion.Rate this question:
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- 5.
The cooling in refrigerator is due to
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Reaction of the refrigerator gas
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Expansion of ice
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The expansion of the gas in the refrigerator
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The work of the compressor
Correct Answer
A. Reaction of the refrigerator gasExplanation
The cooling in a refrigerator is due to the reaction of the refrigerator gas. When the gas in the refrigerator undergoes a chemical reaction, it absorbs heat from the surroundings, causing the temperature inside the refrigerator to decrease. This reaction is facilitated by the compressor, which compresses the gas, causing it to release heat. As a result, the gas cools down and is able to absorb more heat from the refrigerator, maintaining a low temperature inside.Rate this question:
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- 6.
Point out the wrong statement in relation to enthalpy
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It is a state function
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It is an intensive property
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It is independent of the path followed for the change
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Its value depends upon the amount of substance in the system
Correct Answer
A. It is an intensive propertyExplanation
The given statement "It is an intensive property" is incorrect. Enthalpy is an extensive property, meaning it depends on the amount of substance present in the system. Intensive properties, on the other hand, are independent of the amount of substance and only depend on the state of the system.Rate this question:
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- 7.
Which of the following is zero for an isochoric process
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DP
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DV
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DT
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DE
Correct Answer
A. DVExplanation
In an isochoric process, also known as a constant volume process, the volume remains constant. This means that there is no change in volume (dV = 0) during the process. Therefore, the correct answer is dV.Rate this question:
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- 8.
Mark the correct statement
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For a chemical reaction to be feasible,dG should be zero
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Entropy is a measure of order in a system
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For a chemical reaction to be feasible, dG should be positive
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The total energy of an isolated system is constant
Correct Answer
A. The total energy of an isolated system is constantExplanation
The statement "The total energy of an isolated system is constant" is the correct answer because according to the first law of thermodynamics, energy can neither be created nor destroyed in an isolated system. Therefore, the total energy remains constant.Rate this question:
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- 9.
In an isochoric process the increase in internal energy is
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Equal to the heat absorbed
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Equal to the heat evolved
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Equal to the work done
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Equal to the sum of the heat absorbed and work done
Correct Answer
A. Equal to the heat absorbedExplanation
In an isochoric process, the volume remains constant, so no work is done. Therefore, the increase in internal energy is equal to the heat absorbed, as there is no work done to contribute to the increase in energy.Rate this question:
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- 10.
Among them intensive property is
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Mass
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Volume
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Surface tension
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Enthalpy
Correct Answer
A. Surface tensionExplanation
Surface tension is an intensive property because it does not depend on the amount or size of the substance. It is a measure of the force required to stretch or break the surface of a liquid. Regardless of the quantity of liquid, the surface tension will remain the same. In contrast, mass and volume are extensive properties that depend on the amount of substance present, while enthalpy is also an extensive property that depends on the size or quantity of the system.Rate this question:
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Mar 17, 2023Quiz Edited by
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Apr 22, 2020Quiz Created by
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