Multiple choice general knowledge

which of the following is an acid:

  1. H2O

  2. Zn

  3. HCL

  4. all of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Among the given options, only HCl (hydrochloric acid) is an acid. H2O is water (neutral), Zn is zinc (a metal), and 'all of these' is incorrect because water is not an acid. Acids are substances that donate protons (H+) in solution, and HCl is a classic example of a strong acid.

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