7. Which of the following substance(s) doldoes not become liquid on heating? (a) Glucose (b) Ammonium chloride (c) Dry ice (1) (a) and (b) (2) Only (a) (3) (b) and (c) (4) (a) and (c)
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Answer:
B) sodium chloride
Explanation:
Sublimation is the process of a substance changing directly from the solid to the gas phase without passing through the intermediate liquid phase. Iodine and ammonium chloride produces fumes on gentle heating while sodium chloride does not sublime.
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