A few drops of a colourless indicator are added to test tubes labelled as ‘A’ and ‘B’, each containi….

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A few drops of a colourless indicator are added to test tubes labelled as ‘A’ and ‘B’, each containing some colourless solution. The colour of the solution in the test tube ‘A’ turns pink on addition of the indicator, but no colour change is observed in the test tube ‘B’. Which of the following is the correct combination of indicator and the solutions in the test tubes ‘A’ and ‘B’, respectively?

Options :-

1. Litmus; Soap solution and Vinegar
2. Turmeric; Soap solution and Vinegar
3. Phenolphthalein; Soap solution and Vinegar
4. China rose extract; Soap solution and Vinegar

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