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Thermodynamics Test - 4

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Thermodynamics Test - 4
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  • Question 1
    1 / -0
    The apparatus used for measuring heat change is called
  • Question 2
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    first law of thermodynamics is a restatement of

    Solution

    It is restatement of law of conservation of energy.

    It states that Thermodynamics isthe branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.

  • Question 3
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    Calorimetry is an experimental technique or process of

    Solution

    Calorimetry is an experimental technique or process of measuring the heat of chemical reactions or physical changes as well as heat capacity.

  • Question 4
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    Pressure on the system remains constant in
  • Question 5
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    In a closed system, Which of the following take place ?

    Solution

    In a closed system, there is no flow of matter from system to surrounding or vice versa.

    For example, a certain quantity of fluid bounded within a closed cylinder constitutes a closed system.

  • Question 6
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    Standard enthalpy of fusion or molar enthalpy of fusion is

    Solution

    Molar enthalpy of fusion (always increases i.e. △H= positive) is the amount of energy needed to change completely one mole of a substance from the solid phase to the liquid phase in standard state.

  • Question 7
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    Two moles of helium gas is expanded isothermally and irreversibly at 27oC from volume 1 dm3 to 1 m3 at a constant pressure of 100 kPa. Calculate the work done.
  • Question 8
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    Thermodynamics is the branch of physical science concerned with

    Solution

    Thermodynamics deals with heat and its transformation from one form to another.

    The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.

  • Question 9
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    A tightly closed thermos flask contains some ice cubes. This is an example of
  • Question 10
    1 / -0
    Evaporation of water from a pond is an example of
  • Question 11
    1 / -0
    The sum of all forms of energy including kinetic energy and potential energy is called
  • Question 12
    1 / -0
    When a gas is subjected to adiabatic expansion, it gets cooled due to the
  • Question 13
    1 / -0
    The internal energy of one mole of a gas is
  • Question 14
    1 / -0
    A property whose value depends only on the state of the system and not on the path is termed as
  • Question 15
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Which of the following statements is false?
  • Question 16
    1 / -0
    In thermodynamics, a process is reversible when
  • Question 17
    1 / -0
    Directions: Match the statements/expressions in Column–I with the statements/expressions in Column–II and indicate your answer by selecting the appropriate option. Any statement in Column–I can correctly match with only one statement in Column–II.

    Column–I Column–II
    (A) Adiabatic process (a) –w = q
    (B) Endothermic process (b) Destruction of minimum work
    (C) Isothermal process (c) q = 0
    (D) Reversible compression (d) H > 0
     
  • Question 18
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    In a closed container, a liquid is stirred with a paddle to increase the temperature. Which of the following expressions is true?
  • Question 19
    1 / -0
    Which of the following is an intensive property?
  • Question 20
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    The molar heat capacity of water at constant pressure C is 75 JK-1 mol-1. When 1.0 kJ of heat is supplied to 100 g of water, which is free to expand, then the increase in temperature of water is
  • Question 21
    1 / -0

    In an open system, which if the following take place ?

    Solution

    In open system there is flow of matter and energy in and out of the system or vice versa.

    For example, an air compressor in which the air enters at a low pressure and exit at high pressure and there is energy interaction with the surrounding

  • Question 22
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    The relationship between Cp and Cv for one mole of an 

    Solution

    For a mole of ideal gas, The difference between Cp and Cv is always constant i.e. equals to gas constant.

    Therefore, for one mole of an ideal gas, Cp- CV = R

  • Question 23
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    The region outside the boundary of a system is known as a/an
  • Question 24
    1 / -0

    According to first law of thermodynamics ΔU = q + w, here what is sign of q and w ?

    Solution

    The first law is simply a conservation of energy equation. q is positive if heat is added to the system, and negative if heat is removed; w is positive if work is done on the system, and negative if work is done by the system.

  • Question 25
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct. 

    Which of the following statements is false?
  • Question 26
    1 / -0
    For the reaction C (graphite)  at 298 K and 1 atm, . What is  if the molar volume of graphite is 0.0053 L? (Given: R = 0.002 kcal mol-1 K-1)
  • Question 27
    1 / -0

    The molar specific heat capacity of a substance is the

    Solution

    Molar specific heat capacity can be defined as the amount of heat energy required to raise the temperature of 1 mole of a substance by 1° C.

  • Question 28
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    Which among the following is not a state function?
  • Question 29
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    Which law of thermodynamics introduces the concept of entropy?
  • Question 30
    1 / -0

    An exothermic process

    Solution

    Exothermic process results in decrease in enthalpy of system hence for exothermic reaction ΔH= -ve. 

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