1.

The order of stability of metal oxides is

Answer»

`Cr_(2)O_(3)ltMgOltAl_(2)O_(3)ltFe_(2)O_(3)`
`Fe_(2)O_(3)ltCr_(2)O_(3)ltAl_(2)O_(3)ltMgO`
`Fe_(2)O_(3)ltAl_(2)O_(3)ltCr_(2)O_(3)ltMgO`
`Al_(2)O_(3)ltMgOltFe_(2)O_(3)ltCr_(2)O_(3)`

SOLUTION :As stability is directly related to LATTICE energy and lattice energy depends on CHARGE and size of ions. So, the order is:
`Fe_(2)O_(3)ltCr_(2)O_(3)ltAl_(2)O_(3)ltMgO`


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