Question

what do lemons, tomatoes, and coffee all have in common chemically? multiple choice they all release oh⁻ ions in solution, making them bases. they all are fruits. they all release h⁺ ions in solution, making them acids. they are all slippery to the touch. they are all neutral in ph.

Explanation:

• Option A: Bases release $\ce{OH^-}$ ions, but lemons, tomatoes, and coffee are acidic, so A is wrong.
• Option B: Coffee is not a fruit, and the question asks for a chemical commonality, so B is irrelevant.
• Option C: Acids release $\ce{H^+}$ ions in solution. Lemons (citric acid), tomatoes (organic acids), and coffee (organic acids like chlorogenic acid) all act as acids by releasing $\ce{H^+}$ ions, so C is correct.
• Option D: Slippery touch is a property of bases, not these acidic substances, so D is wrong.
• Option E: Neutral substances have a pH of 7, but these are acidic (pH < 7), so E is wrong.

Answer:

C. They all release $\boldsymbol{H^+}$ ions in solution, making them acids.