Question

What is the effect of potassium hydroxide solution on litmus paper?

• A. Turns blue litmus to green
• B. Turns blue litmus to red
• C. Turns red litmus to green
• D. Turns red litmus to blue

Answer 1

The correct option is D Turns red litmus to blue

Litmus paper is an indicator which is used to test if a substance is acidic or basic in nature. Acid turns blue litmus paper red and base turns red litmus paper blue.
Potassium hydroxide $\left(\text{KOH}\right)$ is a base. Therefore, it turns red litmus paper blue.