MCQ practice · SSC Chemistry Board questions · Chapter 2: States of Matter
Which is a volatile substance?
Think it through first, then pick an option.
- a SiO₂
- b C₂₀H₄₂
- c Br₂
- d C₁₀H₈
Answer and explanation
Correct answer: d C₁₀H₈
C₁₀H₈: 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 SiO₂: SiO₂: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- b C₂₀H₄₂: C₂₀H₄₂: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- c Br₂: Bromine (Br₂) is a liquid at ordinary temperature, not a solid that sublimes.
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