Which is not a sublime material_______________?
Correct answer: D. Potash alum
- A. Iodine
- B. Benzoic acid
- C. Ammonium chloride
- D. Potash alum
Explanation
Iodine, benzoic acid and ammonium chloride can pass into vapour and then deposit as solid during sublimation. Potash alum does not normally sublime and instead remains as a solid or decomposes on strong heating. Students may choose c because ammonium chloride can appear to disappear on heating, although it actually sublimes and recombines on cooling.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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