An acid base indicator is a dye that is:
a. always the same color
b. colorless
c. the same color in both acids and bases
d. one color in an acid and a different color in a base

The correct answer is Option d.

Explanation:

An indicator is defined as the substance which shows the presence of acid or a base in a solution. They change their color accordingly.

Acid-base indicators are usually weak acids or weak bases. They change their color in the solution with change in the pH.

For Example: Phenolphthalein is an acid-base indicator which remains colorless in acidic solution and changes its color to pink when added to basic solution.

Hence, the correct answer is Option d.

it means there are 3 atoms of oxygen

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