JAMB and WAEC Chemistry questions: Kinetic theory of matter and gas laws

45 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Kinetic theory of matter and gas laws· WAEC

   Which assumption of the kinetic theory fails for real gases at high pressure?

   • Athat the volume of the molecules themselves is negligible
   • Bthat molecules move randomly
   • Cthat collisions occur
   • Dthat gases have mass

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2. Question 22· Kinetic theory of matter and gas laws· JAMB

   What volume does 8 g of oxygen gas occupy at s.t.p.? (O = 16; molar volume = 22.4 dm³)

   • A11.2 dm³
   • B5.6 dm³
   • C22.4 dm³
   • D2.8 dm³

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3. Question 23· Kinetic theory of matter and gas laws· JAMB

   A gas occupies 300 cm³ at 27 °C. At constant pressure, its volume at 127 °C is:

   • A400 cm³
   • B1411 cm³
   • C225 cm³
   • D600 cm³

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4. Question 24· Kinetic theory of matter and gas laws· JAMB

   At constant volume, the pressure of a gas increases when it is heated because its molecules

   • Ahit the walls more often and with greater force
   • Bbecome larger
   • Cattract each other more
   • Dlose energy

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5. Question 25· Kinetic theory of matter and gas laws· JAMB

   Dalton's law of partial pressures states that the total pressure of a gas mixture equals

   • Athe product of the pressures
   • Bthe sum of the partial pressures
   • Cthe average pressure
   • Dthe pressure of the lightest gas

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6. Question 26· Kinetic theory of matter and gas laws· WAEC

   Which of these gases diffuses fastest at the same temperature? [H = 1, He = 4, N = 14, O = 16]

   • Aoxygen
   • Bammonia
   • Cnitrogen
   • Dhelium

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7. Question 27· Kinetic theory of matter and gas laws· WAEC

   A gas has a volume of 250 cm³ at 27 °C. Find its volume at 87 °C at constant pressure.

   • A250 cm³
   • B805 cm³
   • C208 cm³
   • D300 cm³

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8. Question 28· Kinetic theory of matter and gas laws· JAMB

   How many moles of gas occupy 24 dm³ at room temperature and pressure? (Molar volume = 24 dm³)

   • A24 mol
   • B1 mol
   • C0.5 mol
   • D2 mol

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9. Question 29· Kinetic theory of matter and gas laws· JAMB

   Ammonia and hydrogen chloride are released at opposite ends of a long tube. A white ring forms nearer the hydrogen chloride end because

   • Ahydrogen chloride is less dense
   • Bhydrogen chloride diffuses faster
   • Cthe ring is ammonia
   • Dammonia diffuses faster, being lighter

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10. Question 30· Kinetic theory of matter and gas laws· JAMB

    Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain

    • Aequal masses
    • Bequal numbers of molecules
    • Cequal numbers of atoms
    • Dequal densities

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11. Question 31· Kinetic theory of matter and gas laws· JAMB

    Brownian motion provides evidence for

    • Athe random motion of particles
    • Bthe existence of electrons
    • Cradioactivity
    • Dnuclear fission

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12. Question 32· Kinetic theory of matter and gas laws· JAMB

    

    The heating curve shows a pure solid heated steadily. The substance is melting between

    • AC and D
    • BA and B
    • CB and C
    • DE and F

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13. Question 33· Kinetic theory of matter and gas laws· WAEC

    Diffusion is fastest in

    • Asolids
    • Bliquids
    • Cgases
    • Dmetals

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14. Question 34· Kinetic theory of matter and gas laws· WAEC

    Gas X diffuses four times as fast as oxygen under the same conditions. Find the relative molecular mass of X. [O = 16]

    • A16
    • B8
    • C128
    • D2

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15. Question 35· Kinetic theory of matter and gas laws· JAMB

    Under the same conditions, hydrogen (H₂ = 2) diffuses how many times as fast as oxygen (O₂ = 32)?

    • A16
    • B4
    • C2
    • D8

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16. Question 36· Kinetic theory of matter and gas laws· JAMB

    What volume does 2 g of hydrogen gas occupy at s.t.p.? (H = 1; molar volume = 22.4 dm³)

    • A22.4 dm³
    • B11.2 dm³
    • C44.8 dm³
    • D2 dm³

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17. Question 37· Kinetic theory of matter and gas laws· WAEC

    According to the kinetic theory, gas pressure is caused by

    • Aattraction between molecules
    • Bcollisions of molecules with the container walls
    • Cthe weight of the gas only
    • Dheat alone

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18. Question 38· Kinetic theory of matter and gas laws· JAMB

    A gas has a vapour density of 32. Find its relative molecular mass.

    • A64
    • B32
    • C16
    • D128

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19. Question 39· Kinetic theory of matter and gas laws· JAMB

    According to Graham's law, the ratio of the rate of diffusion of hydrogen to that of oxygen is [H = 1, O = 16]

    • A4 : 1
    • B1 : 4
    • C16 : 1
    • D1 : 16

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20. Question 40· Kinetic theory of matter and gas laws· WAEC

    According to the kinetic theory, the particles of a gas

    • Aare at rest
    • Bare fixed in position
    • Cattract each other strongly
    • Dmove randomly at high speed

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    Explanation and discussion