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Which of the following is correct for mo...

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.

Text Solution

Verified by Experts

The correct Answer is:
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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Knowledge Check

  • Which of the following is not correct for carbon monoxide ?

    A
    It is a colorless gas.
    B
    It is an odorless gas.
    C
    It is highly soluble in water.
    D
    It is a neutral oxide.

  • Which of the following is not a normal oxide

    A
    `Na_(2)O`
    B
    `Al_(2)O_(3)`
    C
    `KO_(2)`
    D
    MgO

  • Which of the following order is correct for the thermal stability of alkali metal carbonates?

    A
    `Li_2CO_3 lt K-2CO_3 lt Na_2CO_3 lt Cs_2 CO_3 lt Rb_2CO_3`
    B
    `Cs_2 CO_3 lt Rb_2 CO_3 lt K_2CO_3 lt Na_2CO_3 lt Li_2CO_3`
    C
    `Na_2CO_3 lt K_2CO_3 lt Cs_2 CO_3 lt Li_2CO_3 lt Rb_2CO_3`
    D
    `Li_2CO_3 lt Na_2CO_3 lt K_2CO_3 lt Rb_2CO_3 lt Cs_2 CO_3`

    • Similar Questions

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    Which of the following is incorrect about the hydroxides of alkali metals?

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    Which of the following is not correct about the hydrides of alkali metals ?

    Which of the following is correct regarding the reaction of alkali metals with halogens ?

    Which of the following trend is correct regarding reactivity of alkali metal oxide ?

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