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

Gujarat BoardEnglish MediumSTD 8ScienceMaterials : Metals and Non-Metals1 Mark
MCQ
Paheli wants to know that how do we get magnesium hydroxide solution?
  • A
    When magnesium burns in air.
  • B
    When magnesium burns underwater.
  • ✓
    When ash of magnesium dissolve in water.
  • D
    When hydrogen and oxygen both react with magnesium.
✓

Answer

Correct option: C.
When ash of magnesium dissolve in water.
When magnesium burns in air it combines with oxygen of air to form magnesium oxide $($which is a basic oxide$).$ Magnesium oxide dissolves in water to form magnesium hydroxide solution. Magnesium hydroxide turns red litmus. It is a base and that magnesium oxide is a basic oxide.

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