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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals1 Mark
MCQ
Which among the following statements is incorrect for magnesium metal?
  • A
    It burns in oxygen with a dazzling white flame.
  • ✓
    It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
  • C
    It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.
  • D
    It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.
✓

Answer

Correct option: B.
It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
Reaction of metals and water produce hydrogen gas and respective hydroxide. For example sodium metal gives sodium hydroxide and liberates hydrogen gas when react with water. Magnesium when reacts with water gives magnesium hydroxide and hydrogen gas and not magnesium oxide.

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