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Physics problem!!!!

You are provided with three test tube containing distilled water ,an acid and a base solution respectively .If you are given only blue litmus paper, how do you identity the contents in each test tube?????

This is chemistry problem


You will be add blue litmus paper in distilled water it will remains same.... When you add this litmus paper in acid solution then blue litmus paper changes to red When u add this in base solution it turns red to blue......
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Pick as the best and click thankyou pls pls pls....pls
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