Make up the equations o f the reactions

Fe₂O₃ + H₂ =

Fe + O₂ =

Fe₂O₃ + CO =

Fe + Cl₂ =

Fe + HNO₃ =

Fe(OH)₂ + O₂ + H₂O =

FeSO₄ + KMnO₄ + H₂SO₄ =

Fe₂O₃ + Na₂CO₃

FeCl₃ + Cu =

FeCl₃ + KI =

FeCl₃ + K₄[Fe (CN)₆] =

FeCl₂ + K₃[Fe (CN)₆] =

FeCl₃ + KCNS =

Na₂FeO₄ + H₂SO₄ =

Na₂FeO₄ + NH₄OH =

Co + HNO₃ =

Co + O₂ =

Ni + O₂ =

Co(OH)₂ + O₂ + H₂O =

CoCl₂ + Br₂ + NaOH =

Ni(OH)₃ + HCl =

Co(OH)₃ + H₂SO₄ =

Co(NO₃)₂

NiSO₄ + NH₃ =

9. The sum of coefficients of the equation of the reaction of cobalt (ІІ) hydroxide with water solution of hypobromite of sodium is equal to:

А. 6

В. 7

С. 9

D. 14

Е. 18

10. The sum of coefficients of the equation of the reaction of hydroxide of nickel with chlorine in the medium of hydroxide of sodium is equal to:

А. 6

В. 7

С. 9

D. 13

Е. 17

11. The sum of coefficients of the equation of the reaction of sulfate of iron (ІІ) with a solution of potassium permanganate acidified by sulfuric acid is equal to:

А. 24

В. 28

С. 36

D. 43

Е. 49

12. The sum of atoms of oxygen of the equation of the reaction of sulfate of iron (ІІ) with a solution of potassium permanganate acidified by sulfuric acid is equal to:

А. 56

В. 72

С. 80

D. 98

Е. 114

20. The sum of atoms of oxygen of the equation of the reaction of hydroxide of nickel (ІІІ) with muriatic acid is equal to:

А. 12

В. 34

С. 56

D. 68

Е. 72

31. The sum of coefficients of the equation of the reaction of water solutions of chloride of iron (ІІІ) and soda is equal to:

А. 16

В. 19

С. 22

D. 26

Е. 31

32. The sum of atoms of oxygen of the equation of the reaction of water solutions of chloride of iron (ІІІ) and soda is equal to:

А. 12

В. 18

С. 24

D. 38

Е. 56

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