Quiz  /  Phase Transformation Class 12 MCQ Questions With Answers

  • 1. 
    What is point B?

  • triple point
  • critical point
  • equilibrium point
  • normal melting point

  • 2. 
    What is the normal boiling point of CO2?

  • -78.5 °C
  • -56.7 °C
  • 31 °C
  • It doesn't have a normal boiling point.

  • 3. 
    What state of matter is Z?

  • solid
  • liquid
  • gas
  • supercritical fluid

  • 4. 
    What is the normal boiling point of this substance?

  • 150 °C
  • 100 °C
  • -50 °C
  • 0 °C

  • 5. 
    Water exists as a _____________ at 700 mmHg and 50 °C.

  • solid
  • liquid
  • gas
  • supercritical fluid

  • 6. 
    What is true regarding CO2 for temperatures above 31 °C?

  • It can never be liquified.
  • It decomposes.
  • It has a high pressure.
  • It is a plasma.

  • 7. 
    What phase change(s) may occur at pressures below 4.58 mmHg?

  • sublimation/deposition
  • melting/freezing
  • all phase changes are possible at these pressures
  • vaporization/condensation

  • 8. 
    What is point A?

  • triple point
  • critical point
  • equilibrium point
  • normal melting point

  • 9. 
    What change occurs from F to E?

  • sublimation
  • deposition
  • melting
  • condensation

  • 10. 
    At 10 atm, dry ice is heated from -100 °C to 30 °C. What changes occur?

  • freezing, then condensation
  • melting only
  • sublimation only
  • melting, then boiling

  • 11. 
    What is the normal melting point of CO2?

  • -78.5 °C
  • -56.7 °C
  • 31 °C
  • It doesn't have a normal melting point.

  • 12. 
    What change occurs from C to D?

  • condensation
  • vaporization
  • melting
  • sublimation

  • 13. 
    At 0.10 atm, what phase(s) can exist?

  • solid, liquid or gas
  • liquid or gas
  • solid only
  • gas only

  • 14. 
    Based on its phase diagram, which is the most dense state for CO2?

  • gas
  • liquid
  • solid
  • supercritical fluid

  • 15. 
    What is the normal melting point of this substance?

  • 150 °C
  • 100 °C
  • -50 °C
  • 0 °C

  • 16. 
    Water exists as a _____________ at 3 mmHg and 50 °C.

  • solid
  • liquid
  • gas
  • supercritical fluid

  • 17. 
    Below the temperature of point B, this substance can exist as a ____________.

  • solid only
  • liquid only
  • gas only
  • either a solid, liquid or gas

  • 18. 
    What state of matter is Y?

  • solid
  • liquid
  • gas
  • supercritical fluid

  • 19. 
    Which statement is true for carbon dioxide at -60 °C?

  • All three phases are possible.
  • It can exist as a solid or a gas, depending on pressure.
  • It is a solid.
  • With enough pressure it can be melted.

  • 20. 
    What change occurs from E to C?

  • sublimation
  • freezing
  • melting
  • boiling

  • 21. 
    What state of matter is X?

  • solid
  • liquid
  • gas
  • supercritical fluid

  • 22. 
    Based on this phase diagram, which state is the most dense?

  • gas
  • solid
  • liquid
  • solid and liquid have equal densities

  • 23. 
    Above the temperature of point B, this substance exists as a ____________.

  • solid
  • liquid
  • gas
  • supercritical fluid

  • 24. 
    The pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg. In order, what changes occur?

  • deposition, melting
  • sublimation, melting
  • condensation, freezing
  • deposition, freezing
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