This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Step 1: Analyze the definition of a chemical property of an acid. A chemical property describes how a substance reacts with other substances or changes its chemical composition. For acids, these properties include reactions with metals, bases, carbonates, and certain salts. Step 2: Evaluate each option to determine if it describes a chemical property of an acid. (A) Evolution of ammonia gas when heated with ammonium salt: Acids generally do not react with ammonium salts to evolve ammonia gas. This reaction is characteristic of bases* reacting with ammonium salts (e.g., NaOH + NH_4Cl heat NaCl + H_2O + NH_3). Therefore, this is not a chemical property of an acid. (B) Evolution of CO_2 gas when added to a trioxocarbonate (IV) salt: Acids react with carbonates (trioxocarbonate (IV) salts) to produce carbon dioxide gas, water, and a salt. For example, CaCO_3(s) + 2HCl(aq) → CaCl_2(aq) + H_2O(l) + CO_2(g). This is* a chemical property of an acid. (C) Formation of salt and water with alkalis: Acids react with alkalis (bases) in a neutralization reaction to form salt and water. For example, HCl(aq) + NaOH(aq) → NaCl(aq) + H_2O(l). This is* a chemical property of an acid. (D) Formation of salt and hydrogen gas with reactive metal: Acids react with metals that are more reactive than hydrogen to produce a salt and hydrogen gas. For example, Zn(s) + 2HCl(aq) → ZnCl_2(aq) + H_2(g). This is* a chemical property of an acid. Step 3: Identify the statement that is not a chemical property of an acid. Based on the analysis, the evolution of ammonia gas when heated with an ammonium salt is a property of bases, not acids. The final answer is A That's 2 down. 3 left today — send the next one.