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Question

Be and Mg do not react with water. This is because of?


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Solution

  • Magnesium and Beryllium both are alkaline earth metals.
  • Beryllium has an atomic number of 4 and Magnesium has an atomic number of 12.
  • Due to the small size and high ionization energy of Beryllium it is unable to form bonds with the water molecules.
  • Also due to the formation of a thin layer of Beryllium oxide(BeO) over the Beryllium metal, it prevents it from reacting with water at lower temperatures.
  • As a result Beryllium does not react with water.
  • Magnesium when reacts with water form Magnesium hydroxide(Mg(OH)2) which is insoluble in water and thus creates a barrier to the magnesium preventing further reaction.
  • Thus Magnesium also does not reacts with water.

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