Assertion (A): Ammonium hydroxide is Weak Base Reason R: Phenolphthalein becomes pink in NH₄OH

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Assertion-ReasonAcid-Base Indicators in ChemistryStrong and Weak BasesCBSE PYQ

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An aqueous solution turns phenolphthalein solution pink. When another aqueous solution is added to this pink solution, the pink colour disappears. Now when a few drops of the first solution are added to the reaction mixture, the mixture appears pink again. The respective changes in the nature of the solution are from :