А. FeCl2
B. Fe(OH)Cl
C. Fe(OH)Cl2
D. Fe(OH)2Cl
Е. FeCl3
10. Iron forms several carbonyls. One of them contains 33,33 % Fe. What is the molecular formula of a compound if at decomposition of it 0,1 mole 16,8 g of iron is obtained:
А. Fe(CO)2
В. Fe(CO)3
С. Fe(CO)4
D. Fe3(CO)12
Е. Fe2(CO)8
9. Products of iron (ІІІ) chloride interaction with potassium iodide are:
А. FеI3 + КСl;
В. FeI2 + КСl;
С. FeCl2 + I2 + КСl;
D. Fe + I2 + KCl
3. Nickel can displace the other metal from a solution of salt:
А. Ca(NO3)2
B. Al2(SO4)3
C. ZnSO4
D. FeCl2
E. CuSO4
4. Iron will dissolve with the greatest rate in:
А. concentrated sulfuric acid
B. sulfuric acid of medium concentration
C. diluted sulfuric acid
D. oleum
13.Chemical activity in the series Fe - Co - Nі:
А. Increases
В. Decreases
С. it is increased, and then decreases
D. decreases, and it is then increased
Е. Practically does not change
14. In series of compounds Fe (ІІ) - Co (ІІ) - Nі (ІІ) the properties of reducing agents:
А. Are increased
В. Decrease
С. are increased, and then decrease
D. decrease, and are then increased
Е. Practically do not change
15. In the series of metals Fe - Co - Nі stability of compounds with oxidation state (+3):
А. It is increased
В. Decreases
С. it is increased, and then decreases
D. decreases, and it is then increased
Е. Practically does not change
6. Open-hearth pig iron is an alloy of iron in which the mass fraction of carbon is equal to:
А. Smaller 0,3 %
B. 0,3-1,9 %
C. 1,9-2,5 %
D. 2,5-6 %
Е. Over 6 %
7. Ductile iron is an alloy of iron in which the mass fraction of carbon is equal to:
А. Smaller 0,3 %
B. 0,3-1,9 %
C. 1,9-2,5 %
D. 2,5-6 %
Е. Over 6 %
8. Pig-iron is characterized by the following properties:
А. High hardness
B. It is easily forged
C. High fragility
E. Plasticity
9. Steel is characterized by the following properties:
А. High hardness
B. It is hardly forged
C. High fragility
E. Plasticity
Make up the equations o f the reactions 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