A) Alizarin-S
B) Quinalizarin
C) Phenolphthalein
D) Benzene
Correct Answer: A
Solution :
F is detected easily from the reaction of fluoride ion with zirconium alizarin -S dye. \[{{\text{F}}^{-}}\]reacts with zirconium and form colourless zirconium fluoride. The colour of dye becomes weak with the increase in the amount of fluorides.
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