Question

you are provided with three test tube with different liquids, what will you observe when you put a blue litmus paper, red litmus paper & few drops of phenolphthalein solution in each test tube
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Answer 1

-If there the liquid is acidic the blue litmus paper will change into red, red litmus paper will be as it is and phenolphthalein indicator change the liquid to colourless.

-If there the liquid is basic the blue litmus paper will be same ,red litmus paper will change into blue and phenolphthalein indicator change into pink.

hope it helps.