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Standard VII
Chemistry
Litmus
Question

You are provided with three test tubes A, B and C which contain distilled water, acidic solution and basic solution respectively. If you are given blue litmus paper only, how will you identify the contents of each test tube.

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Solution
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The given blue litmus paper is dipped in the given solutions. The solution which turns blue litmus red is acidic solution. Now tear this blue litmus turned red into 2 halves. Now, the solution which turns it blue again is the acidic solution and the one which does not affect it is distilled water.

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