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0. pH paper is separately dipped into 2 different solutions X and Y. Colour of pH paper turned pale green in X and blue in Y. X and Yare most probably (NTSE Tamil Nadu, Stage-I, 2016-17)
X-water, Y-NaOH
X-NaOH, Y-H2O
X-HCI, Y-NaOH
X-NaOH, Y-HCI
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