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What is an olfactory indicator? Name two...

What is an olfactory indicator? Name two olfactory indicators. What is the effect of adding sodium hydroxide solution to these olfactory indicators?

Text Solution

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Those substances whose smeel (or odour) changes in acidic or basic solutions are called olfactory indicators. Onion and vanilla extract are olfactory indicators.
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Knowledge Check

  • Olfactory indicators show change in:

    A
    Smell
    B
    Physical state
    C
    Color
    D
    Chemical state
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