The process by which a solid changes directly into a gas without becoming liquid is called:
Difficulty: Hard
About this MCQ
This Hard Everyday Science MCQ checks one syllabus fact. Candidates use it for PPSC Lecturer, FPSC CSS practice.
The question is: “The process by which a solid changes directly into a gas without becoming liquid is called:”
The accepted answer is C. Sublimation. Sublimation is the phase transition from solid to gas without passing through the liquid state. Common examples include dry ice (solid CO2) and naphthalene.
- A. Evaporation
Why not A: Evaporation is liquid to gas.
- B. Condensation
Why not B: Condensation is gas to liquid.
- C. Sublimation ✓
- D. Melting
Why not D: Melting is solid to liquid.
Correct answer
C. Sublimation
Explanation
Sublimation is the phase transition from solid to gas without passing through the liquid state. Common examples include dry ice (solid CO2) and naphthalene.
Source: Physical chemistry — phase changes
Tags: Chemistry
Relevant exams: PPSC Lecturer, FPSC CSS
Submitted by: MCQsHub Editorial