A) turns pink with phenolphthalein
B) turns yellow with phenolphthalein
C) has no action on phenolphthalein
D) turns from red to yellow with phenol-phthalein
Correct Answer: A
Solution :
The pH = 10.8, means that the solution is alkaline. Phenolphthalein gives pink colour with alkaline solution hence, the solution will turn pink with phenol-phthalein.
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