Question

a substance that turns litmus paper blue and contains hydroxide ions is most likely

a) a base.
b) water.
c) an acid.
d) a salt.

Explanation:

Analyze the properties of the substance

The substance turns litmus paper blue and contains hydroxide ions (\(\text{OH}^-\)).

Identify the chemical classification

Substances that release hydroxide ions in solution and turn red litmus paper blue are chemically classified as bases.

Answer:

• A) a base. (Correct answer)
• B) water.
• C) an acid.
• D) a salt.