what is litmus paper
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Litmus paper is paper that has been treated with a specific indicator—a mixture of 10 to 15 natural dyes obtained from lichens (mainly Roccella tinctoria) that turns red in response to acidic conditions (pH 7). When the pH is neutral (pH = 7), then the dye is purple.
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Answer:
when we extract liquid from lichen plant it is purple in colour. when the paper is dipped in it, it is called litmus paper. litmus paper turns red in acid and blue in base.
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