Question

Which of the following solution will change the color of blue hibiscus paper from blue to red?

• A. Caustic soda
• B. Limewater
• C. Hydrochloric acid
• D. Potassium hydroxide

Answer 1

The correct option is C

Hydrochloric acid

Hibiscus paper is an indicator made from the petals of hibiscus flower. It changes colour from blue to red in an acidic solution. Caustic soda, limewater and potassium hydroxide are bases. In this solutions, the hibiscus paper remains blue. An acid like hydrochloric acid will change the colour of hibiscus paper from blue to red.