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State PCS PYQPrelims 2024

BPSC – Combined Competitive Examination · Question 20

Which of the following represents the suitable condition for the liquefaction of gases?

  1. Low temperature, high pressure
  2. Low temperature, low pressure
  3. High temperature, high pressure
  4. High temperature, low pressure
Show answer & explanation

Answer: (A) Low temperature, high pressure

Explanation

Gases liquefy when cooled below their critical temperature and compressed.

  • (A) Correct

    Correct: cooling slows molecules and pressure pushes them together.

  • (B) Incorrect

    Wrong: low pressure keeps molecules apart.

  • (C) Incorrect

    Wrong: high temperature resists liquefaction.

  • (D) Incorrect

    Wrong: the opposite of what is needed.