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Materials : Metals and Non-Metals — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceMaterials : Metals and Non-Metals1 Mark
MCQ
An element $X$ reacts with water to from a solution which turns phenolphthalein indicator pink. The element $X$ is most likely to be:
  • A
    Sulphur
  • ✓
    Sodium
  • C
    Carbon
  • D
    Silicon
✓

Answer

Correct option: B.
Sodium

Phenolphthalein is an indicator used in acid-base titrations. It turns colorless in acidic solutions and pink in basic solutions. Sodium is a metal which reacts with water to form sodium hydroxide, which is a base. Hence, phenolphthalein turns the solution pink.

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