Question

Magnesium dissolves in hot water to form a) Mgo b) MgOH c) Mg(OH)2 d) Mgo.Mg(OH)2

Answer 1

Magnesium dissolves in hot water to form c) magnesium hydroxide (MgOH)2.

Reaction of magnesium with water

• Magnesium reacts with hot water to form magnesium hydroxide and hydrogen gas.
• The chemical equation for this reaction is:

           Mg+2H2 O → Mg(OH)2 +H2

• However, it shall be kept in mind that this reaction occurs only in the presence of hot water. Such a reaction will not occur if the water is cold.  

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