1.You have been provided three test-tube.Ones of these test-tubes contains distilled water and other...
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The liquid which turns red litmus into blue is a basic solution.
Use this blue litmus paper to test the solutions in other two test tubes.
The solution from the test tube which turns blue litmus paper to red will be the acidic solution
Then the solution of the test tube which do not change either red or blue litmus paper contain distilled water
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