Verified answer

Объяснение:

а) Mn2O7, CaS,. Fe2O3,. H2O,. SO3

б) оксиды: Mn2O7, Fe2O3, H2O, SO3

в) Al(III)O(II),. Na(I)O(II),. Ca(II)O(II),. P(V)O(II),. Sn(IV)O(II)