MCQ practice · SSC Chemistry Board questions · Chapter 2: States of Matter
Which turns straight from solid to vapour on heating?
Think it through first, then pick an option.
- a C₆H₆
- b C₆H₁₂O₆
- c C₁₀H₁₆O
- d C₁₂H₂₂O₁₁
Answer and explanation
Correct answer: c C₁₀H₁₆O
C₁₀H₁₆O: it is on the book’s list of volatile substances: on heating it turns straight into vapour without melting.
Why the other options are wrong
- a C₆H₆: C₆H₆: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- b C₆H₁₂O₆: C₆H₁₂O₆: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- d C₁₂H₂₂O₁₁: C₁₂H₂₂O₁₁: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
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