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← ScienceWhich outcome occurs when concentrated sulfuric acid is added to sodium chloride crystals?
A)Hydrogen chloride gas evolution✓
B)Sodium sulfate precipitate forms
C)Chlorine gas production increases
D)Sodium bisulfate solution evaporates
💡 Explanation
Hydrogen chloride gas evolves via protonation of chloride ions. Sulfuric acid is a stronger acid than hydrochloric acid; therefore, the acid-base reaction favors HCl formation via the ionic displacement of chloride ions, rather than chlorine gas evolution.
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