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 calcium chloride
- b ammonium chloride
- c potassium chloride
- d sodium chloride
Answer and explanation
Correct answer: b ammonium chloride
Ammonium chloride: 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 calcium chloride: Calcium chloride: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- c potassium chloride: Potassium chloride: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- d sodium chloride: Sodium chloride (edible salt) is not volatile: in a mix with ammonium chloride it stays behind.
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