China rose and turmeric powder are examples of natural indicators. Petals of china rose turn dark pink when added to an acid. They turn green when added to a base. Yellow turmeric powder turns red when added to a base. Leena's teacher gave her two unknown substances X and Y. Leena was asked to identify their nature as acidic or basic. Leena made the following observations: 1. Turmeric powder turned red when added to substance X. 2. Petals of china rose turned dark pink when added to substance Y. Identify X and Y.
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Explanation:
Turmeric: Turmeric is also used as natural indicator. Turmeric is of yellow colour. Turmeric paper turns into red when it is dipped into basic solution. Turmeric paper does not change its colour with acid.
China Rose: China rose is another natural indicator. China rose solution gives dark pink (magenta) colour with acid and green colour with base.
Acid Rain: Carbon dioxide, sulphur dioxide and nitrogen dioxide which are released from vehicles and chimneys mix with droplets of rain and turn the rain water acidic. When this acidic rain water falls over earth, it is known as acid rain. Acid rain damages the buildings and is harmful for plants and animals.
The Taj Mahal, which is made of marble
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