Question

6. The Colour of which of the following substance will not
be different in Acidic and Basic med:
a)Vanilla
b)Onion
(c)
Lemon
d)Clove

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Answer 1

A) Vannila is right answer

Answer 2

They are olfactory indicators so as the name suggests any change in their smell indicates the presence of acid or base.

However thinking about any change in the colour is quite innovative. I don't know the exact answer but I tried to help you in the way I can.