Multiple choice

A purple litmus paper means the liquid is a __________.

  1. weak acid

  2. strong acid

  3. neutral

  4. strong alkali

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

While universal indicator turns purple in strong alkalis, standard litmus paper usually turns blue in alkalis. Given the options, 'strong alkali' is the intended answer for a high pH value.