Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides ?

  • Option 1)

    Al_{2}O_{3}< MgO< Na_{2}O< K_{2}O

  • Option 2)

    MgO< K_{2}O<Al_{2}O_{3}< Na_{2}O

  • Option 3)

    Na_{2}O< K_{2}O< MgO<Al_{2}O_{3}

  • Option 4)

    K_{2}O< Na_{2}O<Al_{2}O_{3}< MgO

 

Answers (1)

As we learnt in

Property of oxides -

Oxides formed of the elements on the left are basic and of the elements on the right are acidic in nature.Oxides of elements in the centre are amphoteric or neutral. 

-

 

 The increasing order of the size of the cations:

A1^{3+}<Mg^{2+}<Na^{+}<K^{+}

We know that the basic nature of cations increases in the size of cation.

So, the correct order of basic strength is:

A1_{2}O_{3}<MgO<Na_{2}O<K_{2}O


Option 1)

Al_{2}O_{3}< MgO< Na_{2}O< K_{2}O

This option is correct.

Option 2)

MgO< K_{2}O<Al_{2}O_{3}< Na_{2}O

This option is incorrect.

Option 3)

Na_{2}O< K_{2}O< MgO<Al_{2}O_{3}

This option is incorrect.

Option 4)

K_{2}O< Na_{2}O<Al_{2}O_{3}< MgO

This option is incorrect.

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