What turns litmus paper blue

A) Acidic substances

B) Alkaline (basic) substances

C) Neutral substances

D) Litmus paper does not change color

Correct Answer:

B) Alkaline (basic) substances

Explanation:

Litmus paper turns blue in the presence of alkaline (basic) substances. It remains red in acidic solutions and typically does not change color in neutral solutions. Litmus paper is a common pH indicator used to determine whether a solution is acidic or basic based on the color change it undergoes.