Answers
Edta forms complex with metal ions in basic solutions. Such type of titration is called complexometric titration . The end points in complexometric titration are detected by metal ion indicators , These indicators are organic dye , they indicate the end points of the EDTA titration by changing the color of metal- dye complex to that of free dye ion.
Towards the end point metal-indicator complex reacts with EDTA to set free indicator ion completely and a color change take place.
Some of commonly used metal ion tndicators are EBT , Calcon PAN .
Hence correct option is metal ion indicator .
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