‘Litmus’, a natural dye, is an extract of which of the following?A.China rose (Gudhal)B.BeetrootC.LichenD.Blueberries (Jamun)
The correct answer is C. Lichen.
Explanation:
Litmus is a water-soluble dye extracted from certain species of lichen, a symbiotic organism composed of a fungus and an alga or cyanobacterium.
It is primarily used as an acid-base indicator in chemistry. Litmus turns red in acidic solutions (pH below 7) and blue in alkaline (basic) solutions (pH above 7).
The other options (China rose, Beetroot, and Blueberries) are also natural sources of pigments but are not used to produce litmus dye. For example:
China rose is used in some pH tests but not for litmus.
Beetroot provides a red pigment (betanin), but it is not used as a pH indicator.
Blueberries contain anthocyanins, which can also change color with pH, but they are not the source of litmus.
Thus, lichen is the correct source of the litmus dye.
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