Some of the natural indicators are red cabbage juice, onion paste, turmeric, lemon juice etc. Natural indicators are turmric,litmus,china rose etc are some natural indicators. Some Natural Indicators are red Cabbage juice,turmeric,china rose[hibiscus] and litmus.

Natural Indicator - Turmeric

Natural indicators are substances that can be found in nature and can be used to test the pH of a solution. They change color when added to an acidic or basic solution. The correct option is A, Turmeric.

Turmeric is a natural indicator that is commonly used in Indian cooking. It contains a yellow pigment called curcumin, which changes color in the presence of an acid or a base.

How does turmeric work as a natural indicator?

Turmeric contains a yellow pigment called curcumin. When turmeric is added to an acidic solution, the curcumin turns red. When it is added to a basic solution, it turns yellow.

Curcumin is a pH-sensitive compound. It exists in two forms - one is yellow and the other is red. The yellow form is present in acidic solutions, and the red form is present in basic solutions. When turmeric is added to a solution, the pH of the solution determines which form of curcumin is present. This, in turn, determines the color of the solution.

Advantages of using turmeric as a natural indicator

- It is easily available.
- It is non-toxic and safe to use.
- It is inexpensive.
- It is a natural substance and does not harm the environment.

Conclusion

Turmeric is a natural indicator that is commonly used in Indian cooking. It contains a yellow pigment called curcumin, which changes color in the presence of an acid or a base. It is non-toxic, safe to use, and easily available, making it an ideal natural indicator.

Turmeric because it is obtained from plants directly whereas others are chemicals