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A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again?(1) HCI solution (2) NaOH solution (3) NH3 solution (4) NaCI solution |
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Answer» A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again? (1) HCI solution (2) NaOH solution (3) NH3 solution (4) NaCI solution |
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