Question

which of the following is not an acid base indicator
1 blue litmus
2 methyl orange
3 phenophtalen
4 digene​

Answer 1

Methyl orange and phenolphthalein use as indicator , In Acidic solution Methyl orange gives red colour but in basic solution it gives yellow colour . In Acidic solution phenolphthalein is colourless but in basic it gives pink colour . They both are used as a pH indicator .

1 digene is not a indicator

Answer 2

Explanation:

phenopthalen from what I guess