21) The test tube 'A' contains water, test tube 'B' contains acidic solution and test
tube 'C' contains basic solution. How could these samples be identified using red
litmus paper
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Explanation:
One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. ... The solution from the test tube which turns blue litmus paper to red will be the acidic solution and solution of the test tube which do not change either red or blue litmus paper contain water.
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