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Acids, Bases and Salts — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceAcids, Bases and Salts1 Mark
MCQ
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:
  • A
    Red and blue
  • B
    Blue and red
  • C
    Pink and colourless
  • ✓
    Colourless and pink
✓

Answer

Correct option: D.
Colourless and pink
Phenolphthalein is a synthetic indicator and is weakly acidic in nature. When it is added to an acidic solution, it turns colourless. In the basic solution, it appears pink in colour. Phenolphthalein is colourless in acidic solution and pink in basic solution.

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