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An acid-base indicator has a K(a) = 3.0 ...

An acid-base indicator has a `K_(a) = 3.0 xx 10^(-5)`. The acid form of the indicator is red and the basic form is blue. Then

A

75 % red form will exist at pH = 4.05

B

75 % blue form will exist at pH = 5.0

C

indicator will show red colour at pH = 3.53

D

Indicator will show blue colour at pH = 5.6

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