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

Дата добавления: 2015-07-25