Which of the following is a base?

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Multiple Choice

Which of the following is a base?

Explanation:
Bases are substances that can accept protons, forming species like OH− in solution. Ammonia does this in water: it accepts a proton from a water molecule to give ammonium and hydroxide, NH3 + H2O → NH4+ + OH−. The production of OH− in solution is what makes the solution basic. Hydrochloric acid is an acid because it donates a proton (H+). Sodium chloride is a neutral salt that doesn’t actively donate or accept protons in solution. Water is neutral overall, and while it can act as an acid or a base in certain reactions, it isn’t categorized as a base in this context. So ammonia clearly behaves as the base among these options.

Bases are substances that can accept protons, forming species like OH− in solution. Ammonia does this in water: it accepts a proton from a water molecule to give ammonium and hydroxide, NH3 + H2O → NH4+ + OH−. The production of OH− in solution is what makes the solution basic.

Hydrochloric acid is an acid because it donates a proton (H+). Sodium chloride is a neutral salt that doesn’t actively donate or accept protons in solution. Water is neutral overall, and while it can act as an acid or a base in certain reactions, it isn’t categorized as a base in this context. So ammonia clearly behaves as the base among these options.

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