Gases

MDCAT • Chemistry

116 MCQs — Click "Reveal" to see the correct answer

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  1. 1
    The relationship between the absolute temperature and the velocities of the gas molecules is given by:
  2. 2
    Conversion of Fahrenheit to Celsius scale is done by:
  3. 3
    Which of the following is NOT the state of matter?
  4. 4
    5 calories are equivalent to how many joules?
  5. 5
    Inter molecular repulsive forces in gases are due to:
  6. 6
    Low atmospheric pressure system is called:
  7. 7
    Sindh MDCAT 2024
    Collection of gas over water is an example of:
  8. 8
    According to Charle's law, at 0K (-273.15°C), the volume of a gas should be:
  9. 9
    FMDC MDCAT 2024 (Reconduct)
    When the pressure of a gas is plotted against volume at constant temperature, the curve obtained is known as:
  10. 10
    PV = 1/3 mNc² is called:
  11. 11
    The S.I. unit of R in general gas equation is:
  12. 12
    Formula for partial pressure calculation of any component in mixture of gases is:
  13. 13
    FMDC MDCAT 2024
    Which of the following law helps to calculate the absolute temperature?
  14. 14
    The correct ideal gas equation is:
  15. 15
    If both temperature and volume of gas are doubled, the pressure:
  16. 16
    The SI unit for pressure is:
  17. 17
    NUMS MDCAT 2023
    The idea that molecules in gases are in constant movement is called:
  18. 18
    Air at sea level is dense. This is a practical application of:
  19. 19
    A set of postulates that explain the behavior of ideal gases is called:
  20. 20
    Which of the following temperatures is referred to as the absolute zero?
  21. 21
    1 atm of nitrogen is at 25°C, its pressure has increased to 2 atm at 50°C. Volume will change from 1 dm³ to:
  22. 22
    Graph of volume versus total pressure at constant temperature is:
  23. 23
    The volume of a given mass of an ideal gas at certain pressure is x at constant temperature. What will be its volume when the pressure is reduced to half?
  24. 24
    1 atm of pressure is equal to all of the following except:
  25. 25
    Which of the following molecules will show a higher rate of evaporation?
  26. 26
    NUMS MDCAT 2022 FMDC MDCAT 2024 (Reconduct)
    Which variable mentioned in ideal gas is assumed to be constant in other gas laws?
  27. 27
    How should the condition be changed to prevent the volume of a given gas from expanding when its mass is increased?
  28. 28
    Which of the following represents equation for ideal gas?
  29. 29
    The volume of a given mass of a gas according to Charle's law should be zero at:
  30. 30
    Ideal gas equation helps to calculate the following property of ideal gas except:
  31. 31
    Sindh MDCAT 2022
    Gases deviate from ideal behavior more:
  32. 32

    The comparison of rate of diffusion of H2 and O2 is in the ratio of:

  33. 33
    Sindh MDCAT 2022
    The kinetic molecular theory of gases explains:
  34. 34

    Which of the following shows marked deviation from ideal behaviour at a given temperature and pressure?

  35. 35
    According to Charles' law, volume of gas reduces to zero at:
  36. 36
    Collisions shown by gases involve the following:
  37. 37
    Air is a mixture of gases. The molecules of air do not settle down due to:
  38. 38
    If we want to raise the temperature of one mole of an ideal gas by 1K, we have to provide how much amount of energy?
  39. 39

    A gaseous mixture contains 9.6% NH3, 22.6% N2 and 67.8% H2 gases. If the total pressure is 50 atm, then the partial pressure of H2 is:

  40. 40
    General gas equation is also known as:
  41. 41
    When temperature increases, isotherm moves?
  42. 42
    212 degree Fahrenheit is expressed in Kelvin as:
  43. 43
    PMC Practice Test 4 2021
    PV/nRT for an ideal gas is called:
  44. 44
    PMDC MDCAT 2020
    The actual volume of gas molecules is considered negligible at following pressures:
  45. 45
    PMDC MDCAT 2020
    According to the general gas equation, density of an ideal gas depends upon:
  46. 46
    ETEA MDCAT 2016
    At absolute zero the molecules of hydrogen gas will have:
  47. 47
    Which of the following statements is applicable for both ideal and real gas molecules?
  48. 48
    Which of the following is the correct equation to calculate relative molecular mass of a gas?
  49. 49
    Gas is enclosed in a container of 20 cm³ with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100°C?
  50. 50
    In the Van der Waals equation, 'b' represents the:
  51. 51
    Identify the value of R at STP.
  52. 52

    There are four gases H2, He, N2 and CO2 at 0°C. Which gas shows greater non-ideal behavior?

  53. 53

    The number of molecules in 22.4 dm³ of H2 gas at 0°C and 1 atm are:

  54. 54
    The root mean square velocity of gases is inversely proportional to square root of their:
  55. 55
    Which one of the following expressions represents the Avogadro law?
  56. 56
    All the collisions between the particles of gases are elastic in nature. What is meant by 'Elastic Collisions'?
  57. 57
    UHS MDCAT 2008

    100 m3 of a gas at 3 atm pressure and 27 is transferred to a chamber of 300 m3 volume maintained at a temperature of 327. What will be the pressure in chamber?

  58. 58
    UHS MDCAT 2008

    The process of effusion is best understood by _ law.

  59. 59
    UHS MDCAT 2009

    Absolute zero is unattainable. Current attempts have resulted in temperature as low as:

  60. 60
    UHS MDCAT 2009

    _ % of the known universe is in the plasma state.

  61. 61
    UHS MDCAT 2009

    In the process of respiration, there is application of:

  62. 62
    UHS MDCAT 2010

    Plasma is the ionized gas mixture which consists of:

  63. 63
    UHS MDCAT 2010

    The root mean square velocity of gases is inversely proportional to the square root of their:

  64. 64
    UHS MDCAT 2010

    Which one of the following mathematical expressions represents the Avogadro’s law?

  65. 65
    UHS MDCAT 2010

    One mole of any gas at standard temperature and pressure (STP) occupies a volume of:

  66. 66
    UHS MDCAT 2012

    The number of molecules in 22.4 dm3 of H2 gas at 0°C and 1 atm are:

  67. 67
    UHS MDCAT 2013

    There are four gases H2, He, N2 and CO2 at 0 °C. Which gas shows greater non-ideal behavior?

  68. 68
    UHS MDCAT 2014

    At a given temperature and pressure, the one which shows marked deviation from ideal behavior is:

  69. 69
    UHS MDCAT 2015

    Which graph represents Boyle’s law?

  70. 70
    UHS MDCAT 2015

    If the volume of a gas collected at a temperature of 600 °C and pressure of 1.05 × 105 Nm-2 is 60 dm3, what would be the volume of gas at STP (P=1.01 × 105 Nm-2, T = 273 K)?

  71. 71
    UHS MDCAT 2017

    28g of N2 at STP will occupy a volume of:

  72. 72
    UHS MDCAT 2017 (Reconduct)

    Identify the value of R at STP:

  73. 73
    UHS MDCAT 2018

    Percentage of nitrogen by volume in air is:

  74. 74
    UHS MDCAT 2018

    Gas is enclosed in a container of 20 cm3 with a moving piston. According to the kinetic theory of gases, what will be the effect on freely moving molecules of the gas if the temperature is increased from 20 to 100?

  75. 75
    UHS MDCAT 2018

    Which of the following is the correct equation to calculate the relative molecular mass of a gas?

  76. 76
    UHS MDCAT 2018

    The liquid in the container has a temperature of 70°C. What will be the temperature on the Kelvin scale?

  77. 77
    UHS MDCAT 2019

    All the collisions between the particles of gases are elastic in nature. What is meant by "Elastic Collisions"?

  78. 78
    UHS MDCAT 2022

    A gaseous mixture contains 9.6% NH3, 22.6% N2 and 67.8% H2 gases. If the total pressure Is 5O atm, then the partial pressure of H2 is

  79. 79
    UHS MDCAT 2023

    The same moles of H2, N2, and O2 are present in 0.1 cc volume at STP. Which one has the greatest number of molecules:

  80. 80
    UHS MDCAT 2023

    The process of heat flow between hotter and colder gases remains continued until all the molecules have equal

  81. 81
    UHS MDCAT 2023

    Which one of the following gases has the lowest density under room conditions?

  82. 82
    UHS MDCAT 2024 FMDC MDCAT 2023

    The real gases show deviation from ideal behaviour at:

  83. 83
    UHS MDCAT 2024

    Intermolecular forces between molecules of ideal gas are:

  84. 84
    PMDC MDCAT 2025

    Value of R gas constant in J mol-1 K-1 is:

  85. 85
    PMDC MDCAT 2025

    Which of the following is true about pressure for an ideal gas at -273° C?

  86. 86
    UHS MDCAT 2024

    The correct ideal gas equation is

  87. 87
    UHS MDCAT 2022

    The process of heat flow between hotter and colder gases remains continued until all the molecules have equal:

  88. 88
    Dimensions o the pressure are the same as that of:
  89. 89
    A pressure of 0.101325 bar when expressed in atmoshpere represents:
  90. 90

    For a definite mass of an ideal gas at constant temperature,the plot of which pair of species will give a curved graph?

  91. 91
    What is Not true about gases?
  92. 92

    8g of methane and 2g of hydrogen are kept at 760 mm pressure at 273 K,the total volume occupied by the mixture will be:

  93. 93
    The molar volume of nitrogen gas is maximum at:
  94. 94
    In gases and liquids,temperature is the measure of-------kinetic energies of molecules:
  95. 95

    The correct value of general gas constant R is:

  96. 96
    A gas initially at 27°C is heated upto 327°C,its average K.E will be:
  97. 97
    Which is the incorrect about ideal gas?
  98. 98

    Which of the following pairs of gases possess equal volume at STP?

  99. 99

    Volume of a gas at STP is 10dm3.At what temperature its volume will become 30dm3, keeping pressure constant?

  100. 100

    Which one is the form of general gas equation?

  101. 101
    If both temperature and pressure of a gas are doubled,the volume:
  102. 102
    A graph between pressure and product of pressure and volume at constant temperature and number of moles is:
  103. 103
    A mono-atomic substance can store energy only in the form of:
  104. 104
    The correct quantitative realtion to know the volumes of the gas at various temperature is:
  105. 105
    If 1/V is plotted on X-axis and pressure on Y-axis at constant temperature,what should appear?
  106. 106
    Under what conditions the density of an ideal gas will be maximum at?
  107. 107
    At constant temperature when the pressure of gas is increased three times then its volume becomes?
  108. 108

    Which is equivalent to the unit of energy?

  109. 109
    The units of R depends on:
  110. 110
    KMT assumes that,gas particles:
  111. 111

    Which of the folllowing exibits the weakest intermolecular forces?

  112. 112
    Who gave the law of distribution of velocities?
  113. 113
    At absolute zero,which statement is correct?
  114. 114
    Quantitative definition of Charle's law is obeyed in------------scale:
  115. 115
    Value of compressibility factor for ideal gas is:
  116. 116
    Which of the following properties is shown by gases?