Quick practice
Question 1 of 5
Fill in the blank appropriately. (Rajyaseva Pre 2013)
A trap laid for apprehending a Govt. employee taking bribe used phenolphthalein powder coated currency notes. A solution of sodium carbonate sprinkled on the notes must turn______ for lending proof for the crime.
A
red
B
black
C
purple
D
blue
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