MCQ practice · SSC Chemistry Board questions · Chapter 2: States of Matter
Which is a sublimed substance?
Think it through first, then pick an option.
- a iodine
- b sulfur
- c urea
- d lime
Answer and explanation
Correct answer: a iodine
Iodine: 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
- b sulfur: Sulfur is not volatile: pure sulfur melts into a liquid at 115°C.
- c urea: Urea is not volatile: it melts into a liquid at 133°C.
- d lime: Lime: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
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