###### Group II of the Periodic Table

Barium is in Group II of the Periodic Table and chlorine is in Group VII. Barium reacts with chlorine to form an ionic compound. Which row shows the electron change taking place for barium and the correct formula of the barium ion?

Barium is in Group II of the Periodic Table. It has metallic properties and has two electrons in the outer electron level. In the interaction with the elements of Group VII of the Periodic Table it will lose electrons and form ions with a positive charge.

###### Group I of the Periodic Table

Which of the following are the properties of the oxides of the elements of Group I?

The correct answer to this question is: Basic/Ionic

###### Group I of the Periodic Table

Natrium, on the left of Period 3 of the Periodic Table, is more metallic than chlorine on the right of this period. Why is this?

Natrium has fewer electrons.​

###### Inorganic Chemistry

What is the valency of iron in the compound that is produced by its interaction with hydrochloric acid?

$$2Fe + 3Cl_2 \to 2FeCl_3$$

###### Inorganic Chemistry

In which row are only acidic oxides listed?

The correct answer is $$CrO_3, N_2O_3, SiO_2$$

###### Inorganic analysis

True or not, the following propositions about the properties of concentrated sulfuric acid?

A: Sulfuric acid carbonizes the organic substances, taking the water away from them.

B: Contact with sulfuric acid on the skin leads to severe burns.

Both propositions are true

###### Group I of the Periodic Table

True or not, propositions about the elements of Group I.

A. These elements form a hydrogen compound with composition - RH.

B. The chemical activity of metals in the row $$Li \to Na \to K$$ increases.

Both propositions are true

###### Group I of the Periodic Table

True or not, propositions about alkali metals and its compounds.

A. All the alkali metals react with oxygen to form peroxides $$M_2O_2$$

B. Alkali metal hydroxides are strong bases.

Alkali metal hydroxides are strong bases.

###### Group II of the Periodic Table

True or not, propositions about the metals of Group II.

A. In the compounds of Group IIA metals all exhibit the oxidation state of +2.

B. Magnesium - a stronger reducing agent than calcium.

In the compounds of Group IIA metals all exhibit the oxidation state of +2.

###### Group I of the Periodic Table

Which of the presented substances do not react with sodium hydroxide solution?

$$MgO$$ does not react with sodium hydroxide solution.

###### Group II of the Periodic Table

Which of the presented substances do not react with magnesium at room temperature?

Sulfur does not react with magnesium at room temperature.

###### Group II of the Periodic Table

What is formed by the interaction of calcium with water?

This reaction is $$Ca + 2H_2O \to Ca(OH)_2 + H_2$$

###### Group II of the Periodic Table

Which of the presented substances reacts with water to form alkali?

The correct answer is $$Ba$$

$$Ba + 2H_2O \to Ba(OH)_2 + H_2$$

###### Group VII of the Periodic Table

Which of the presented substances interacts with chlorine?

The correct answer is $$FeCl_2$$

$$Cl_2 + 2FeCl_2 \to 2FeCl_3$$

###### Group VII of the Periodic Table

What type of reactions come from hydrogen interaction with chlorine?

###### Group VII of the Periodic Table

Which of these compounds react with HCl?

The correct answer is 2 ($$Zn, Fe$$)

$$Zn + 2HCl \to ZnCl_2 + H_2$$

$$Fe + 2HCl \to FeCl_2 + H_2$$

###### Group VII of the Periodic Table

The interaction of the higher chlorine oxide forms acid with water, in which formula.

The higher chlorine oxide is $$Cl_2O_7$$

$$2Cl_2O_7 + H_2O \to 2HClO_4$$