Question

Milk of magnesia turns _________________.

• A. blue litmus to red.
• B. red litmus to black.
• C. red litmus to blue.
• D. blue litmus to black.

Answer 1

The correct option is C

red litmus to blue.

Litmus is the most commonly used natural indicator available as strips of paper or solution. It is extracted from lichens. It turns to red on addition of an acidic solution and turns blue on addition of a basic solution. Since milk of magnesia is basic in nature it will turn red litmus to blue.