a. At what pH does indicator change colo...

a. At what `pH` does indicator change colour if the indicator is a weak acid with `K_(Ind) = 4.0 xx 10^(-4)`.
b. For which of the following neutralisation would the indicator be useful?
i. `HCl +NaOH`
ii. `CH_(3)COOH +NaOH`
iii. `HCl +NH_(3)`
c. Name the indicators which can be used for such titration.

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The correct Answer is:

3, B

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