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  • Explain the following statements : (a) Most metal oxides are insoluble in water but some of these dissolve in water. What are these oxides and their solutions in water called ?

Explain the following statements : (a) Most metal oxides are insoluble in water but some of these dissolve in water. What are these oxides and their solutions in water called ?

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Explanation:

  • Most metal oxides do not dissolve in water. They are insoluble.

  • However, some metal oxides, especially oxides of alkali metals (like sodium and potassium), do dissolve in water.

  • These soluble metal oxides react with water to form alkaline solutions.

These oxides are called: Basic oxides

Their solutions in water are called: Alkalis (basic solutions)?

Examples:

  • Sodium oxide (Na?O) dissolves in water:

    Na2O + H2O → 2NaOH

  • Potassium oxide (K?O) dissolves in water:

    K2O + H2O → 2KOH

So, soluble metal oxides are basic oxides, and their aqueous solutions are alkalis.

Posted by

Saumya Singh

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