7th Class Science Acids, Bases and Salts Question Bank Acids, Bases and Salts

  • question_answer 33) ............... changes odour in acidic and basic medium and is used as an olfactory indicator.

    A) Onion                         

    B) Vanilla

    C) Clove oil        

    D) All of these

    Correct Answer: D

    Solution :

    These are olfactory indicators and change colour in acidic and basic medium.

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