Which of the following is correct for monoxides (normal oxides) of alkali metals ?A. They are ionic and strongly basic oxides.B. They are pure white solids.C. They have anti-fluorite structures.D. All of these.

Which of the following is correct for monoxides (normal oxides) of alk

1.	Which of the following is correct for monoxides (normal oxides) of alkali metals ?A. They are ionic and strongly basic oxides.B. They are pure white solids.C. They have anti-fluorite structures.D. All of these.
Answer» Correct Answer - A They consist of `M^(+) "and" O^(2-)` ions. They react with water forming strong bases : `M_(2)O+H_(2)O to 2MOH` `Li_(2)O "and" Na_(2)O` are pure white solids, but surprisingly, `K_(2)O` is pale yellow, `Rb_(2)O` is bright yellow, and `Cs_(2)O` is orange. The crystal structures of `Li_(2)O, Na_(2)O,K_(2)O " and " Rb_(2)O` are anti-fluorite structures while `Cs_(2)O` has an anti-`CdCI_(2)` layer structure.

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Which of the following is correct for monoxides (normal oxides) of alkali metals ?A. They are ionic and strongly basic oxides.B. They are pure white solids.C. They have anti-fluorite structures.D. All of these.

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