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  4. Litmus is obtained from :

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Q. Litmus is obtained from :

AFMCAFMC 2003

Solution:

Litmus is obtained from lichen spp. like Roccellatinctoria, Roccellamontagnei and Lasalliapustulata. Inferior kinds of litmus is obtained from species of Parmelia, Variolania and Lecanora etc. Litmus is used as acid-base indicator. Acid impart a red colour to blue litmus and alkalis cause reddened litmus to return its original blue colour.