1.

The basic strength of the oxides follows the order

Answer»

`Al_2O_3 gt MGO LT Na_2O`
`Al_2 O_3 lt MgO lt Na_2O`
`Na_2O_3 lt MgO gt Al_3O_2`
`Al _2 O_3 gt MgO gt Na_2O`

ANSWER :B


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