The statement that is not true about indicators is that Bromothymol blue can change blue to yellow around pH=7.
Indicators are chemical species that change color when in acidic, basic or neutral media.
This color change is caused by chemical changes in the indicator molecule.
Bromothymol blue is an indicator that has a yellow color in acidic medium, a green color at pH=7 and a blue color in basic medium.
It is not a true statement that; Bromothymol blue can change blue to yellow around pH=7.
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