A basic solution, containing phenolphthalein indicator, is neutralized by an acid. The neutralized solution is colourless. Doing which of the following will make the solution pink?
P - adding a few drops of the acid
Q - adding a few drops of the basic solution
R - adding a few drops of phenolphthalein
1 only P
2 only Q
3 either P or Q
4 either P or R
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