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 NaCl
- b Br₂
- c I₂
- d NH₃
Answer and explanation
Correct answer: c I₂
I₂: 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 NaCl: NaCl (edible salt) is not volatile: heated in a mix with ammonium chloride, it stays behind.
- b Br₂: Bromine (Br₂) is a liquid at ordinary temperature, not a solid that sublimes.
- d NH₃: NH₃ is a gas at room temperature (book Experiment 3); not a solid, so it does not sublime.
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