To which class of dyes, does phenolphthalein belong 

  1. A

    Nitro dyes 

  2. B

    Azo dyes 

  3. C

    Triphenyl methane dyes

  4. D

    Phthalein dyes

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    Solution:

    • Phenolphthalein is often used as an indicator in acid–base titrations. 
    • For this application, it turns colorless in acidic solutions and pink in basic solutions. 
    • It belongs to the class of dyes known as phthalein dyes.
    • Chemical formula:C20​H14​O4​
    solution

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