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Select the correct statement(s).
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Correct option is B
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Following are some of the certain facts of Ostwald's theory of acid-base indicators.
I : Ionised and unionised forms have different colours.
II : Colour change is indicated at the end point when unionised form changes to ionised form due to change in pH.
III : Benzenoid form changes to quinonoid form and vice-versa due to change in PH.
Select the correct facts
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