Ba-X1-X2-Ba(NO3)2

1)Ba(OH)2 и BaCl2

2)Ba(OH)2 и BaSO4

3)BaCl2 и BaO

4)BaCl2 и BaSO4

 

Fe2(SO4)3-X1-X2-Fe(OH)3

1) FeP04 и FeO

2) Fe2S3 и Fe2O3

3) FeBr3 и Fe2O3

4) FeCl3 и Fe(N03)3

 

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