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Acids, Bases and Indicators

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Multiple Choice

A group of students was doing an experiment using sodium hydroxide and dilute hydrochloric acid. They added phenolphthalein indicator, which gave the solution a pink colour. As more and more dilute hydrochloric acid was added to it, drop by drop, at one point a colour change was noted. This happened due to neutralisation reaction. The colour changes from pink to _________.

  1. blue
  2. green
  3. red
  4. violet
  5. colourless
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