Question

29.Which of the following is not an example of an acid-base indicator?Select one:a. Phenolphthaleinb. Litmus paperc. Hydrion paperd. Filter paper

Answer 1

`D\text{ : Filter Paper}`

Step-by-step explanation:

Here, we want to select the option that is not an acid-base indicator from the options

Acid-base indicators are colored materials that are expected to change color based on the pH

A filter paper is a material used in filtration

As such, it cannot be used as an indicator