MCQ practice · SSC Chemistry Board questions · Chapter 2: States of Matter
Which substance behaves differently on heating?
Think it through first, then pick an option.
- a MgCl₂
- b CaCl₂
- c ZnCl₂
- d AlCl₃
Answer and explanation
Correct answer: d AlCl₃
AlCl₃: 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 MgCl₂: MgCl₂: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- b CaCl₂: CaCl₂: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
- c ZnCl₂: ZnCl₂: it is not among the book’s six volatile substances, so it is not taught as a subliming substance.
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