Question

Identify the colour change, when curd is tested with litmus paper?

• A. Red litmus to green.
• B. Blue litmus to red.
• C. Red litmus to blue.
• D. Blue litmus to green.

Answer 1

The correct option is B

Blue litmus to red.

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. Curd has lactic acid in it so it will turn blue litmus to red.