MCQ practice · SSC Chemistry Board questions · Chapter 2: States of Matter
Which of these is a sublimed substance?
Think it through first, then pick an option.
- a iodine
- b potassium sulfate
- c calcium sulfate
- d sodium carbonate
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 potassium sulfate: Potassium sulfate: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- c calcium sulfate: Calcium sulfate: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- d sodium carbonate: Sodium carbonate: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
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