MCQs chemistry class 12

mcqs chemistry class 12

MCQs chemistry class 12 are here Put your knowledge of chemistry to the test with our selection of these 20 multiple choice questions covering some part syllabus for class 12 Get ready to get top marks in your 12 class exams with these helpful chemistry MCQs. Get exam ready with this comprehensive collection of chemistry MCQs for class 12! With questions that cover all the required topics, you will be able to prepare effectively and score high in your upcoming multiple-choice questions-based tests. these MCQs chemistry will help you in the universities entrance tests as well as job tests check out more chemistry MCQs class 11

MCQs chemistry class 12 let’s Get started

  1. The volume of 3.01 × 10²³ Helium molecules at S.T.P will be.
    A. 22.4 ft³
    B. 22.4 dm³
    C. 44.8 dm³
    D. 11.4 dm³
    Correct Answer: 11.4 dm³
  2. Gases diffuse more rapidly than liquids and solids due to.
    A. Collision of molecules with walls of the container
    B. High kinetic energy
    C. Absence of intermolecular forces
    D. None of these
    Correct Answer: Absence of inter-molecular forces
  3. Real gases deviate from the behavior of ideal gas because.
    A. Absence of intermolecular forces
    B. High kinetic energy of molecules
    C. Rapid motion of molecules
    D. Presence of intermolecular forces
    Correct Answer: The presence of intermolecular forces
  4. 15 dm³ methane takes 4 minutes to effuse completely. What is needed by 15 dm³ Helium (He) to effuse under the same conditions?
    A. 8 minutes
    B. 16 minutes
    C. 12 minutes
    D. 2 minutes
    Correct Answer: 2 minutes
  5. A gas is placed in a 1000 mL vessel at 3040 mm Hg and 0°C. What will be the volume of the same gas at 546 k and 2 atm?
    A. 4000 mL
    B. 500 mL
    C. 200 mL
    D. 2000 mL
    Correct Answer: 4000 mL
  6. A moist gas is collected over water at 40°C and a pressure of 760 torrs. What is the pressure of dry gas if the vapor pressure of water at 40°C is 55.3 torr?
    A. 704.7 torr
    B. 760 torr
    C. 670.4 torr
    D. None of these
    Correct Answer: 704.7 torr
  7. Which of these laws states that ” The product of pressure and volume of a given mass of gas is constant at constant temperature”?
    A. Boyle’s law
    B. Charles law
    C. Combined gas law
    D. Graham’s law
    Correct Answer: Boyle’s law
  8. In which state free movement of molecules cannot take place?
    A. Gas
    B. Liquid
    C. Solid
    D. None of these
    Correct Answer: Solid
  9. The mixing of gas molecules to form a homogeneous mixture is called:
    A. Diffusion
    B. Effusion
    C. Compression
    D. Expansion
    Correct Answer: Diffusion
  10. The statement ” The volume of a gas is directly proportional to a number of molecules” belongs to the law.
    A. Boyle’s law
    B. Charles law
    C. Graham’s law
    D. Avogadro’s law
    Correct Answer: Avogadro’s law
  11. The statement” the volume of gas is directly proportional to absolute temperature ” belongs to.
    A.Boyle’s law
    B. Charles law
    C. Graham’s law
    D. Avogadro’s law
    Correct Answer: Charles’s law
  12. The law of diffusion is applied to those gases.
    A. Collected over water
    D. Collected as dry
    C. Collected as moisture
    D. None of these
    Correct Answer: Collected over water
  13. The ratio between rates of diffusion of n2 and CO is:
    A. 2:1
    B. 1:2
    C. 1:1
    D. 4:1
    Correct Answer: 1:1
  14. The shape of Charles’s law is.
    A. Straight line
    B. Parabolic
    C. Hyperbolic
    D. Any of these
    Correct Answer: Straight line
  15. The pressure of gas is caused by.
    A. Large intermolecular forces
    B. Intermolecular collision
    C. Fast motion of molecules
    D. Collision of molecules with walls of the container
    Correct Answer: Collision of molecules with walls of the container
  16. Which property is associated with a gaseous state?
    A. Negligible compressibility
    B. Definite volume
    C. Large intermolecular spaces
    D. Definite shape
    Correct Answer: Large intermolecular spaces
  17. Molar quantities of gas can be expressed in the:
    A. Molar volume
    B. Molar mass
    C. Atomic weigh
    D. Both a and b
    Correct Answer: Molar volume
  18. S.I. unit of pressure?
    A. N.s.m²
    B. Pascal
    C. Kg.m¹.s²
    D. None of these
    Correct Answer: Pascal
  19. The behavior of real gas approaches ideal behavior at.
    A. Low temperature, low pressure
    B. Low temperature, high pressure
    C. Both a and b
    D. High temperature, low pressure
    Correct Answer: High temperature, low pressure
  20. What happens if the volume of gas is slowly increased at a constant temperature?
    A. Pressure decreases
    B. K.E of molecules remains the same
    C. K.E of molecules decreases
    D. Both a and c
    Correct Answer: Both a and c

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