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Magnesium hydroxide [Mg(OH)2] is used as

  • A.oxidizing agent
  • B.reducing agent
  • C.anti-acid
  • D.fermentation agent

Answer: C

Magnesium hydroxide is used as an antacid.

Mg(OH)2 is a mild base, sold as milk of magnesia. Taken by mouth it neutralises excess hydrochloric acid in the stomach, relieving acidity and indigestion:

Mg(OH)2 + 2HCl → MgCl2 + 2H2O

It is neither an oxidizing nor a reducing agent in this use, since no electrons are transferred in neutralisation, and it has no role in fermentation.

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