Test task with an answer on the topic “Compounds of chemical elements. The degree of oxidation »are compiled in accordance with the mandatory minimum content of the main educational program of O.S. Gabrielyan for the course of chemistry of the 8th grade.
The test can be used to consolidate and test the knowledge of students, to prepare for the GIA, tests and tests.
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Test. Valence. The degree of oxidation.
- The degree of oxidation is
1) the number of chemical bonds formed by an atom of a chemical element
2) the conditional charge of an atom, calculated on the basis of the assumption that the compound is built according to the ionic type
3) a number equal to the number of electrons in an atom
4) a number equal to the number of electrons in the outer level of the atom
2.Maximum valency of the phosphorus atom:
1)+5 2)V 3)+4 4)IV
3. Minimum valency of the chlorine atom:
1) VI 2) -6 3) I 4) -1
4.Maximum oxidation state of chlorine:
1) VII 2)-2 3)II 4)-1
5. The minimum oxidation state of the carbon atom6
1)V 2)-4 3)II 4)+2
6. A negative value of the oxidation state cannot have an atom of a chemical element:
1) Br 2) N 3) Mg 4) P
7. The maximum value of the oxidation state +2 can have an atom of a chemical element:
1) Al 2) S 3) Si 4) O
8. The oxidation state -3 nitrogen has in the substance:
1)NH3 2)N2O3 3)N2 4)NF3
9. A substance in which the oxidation state of chromium is +6:
1)Cr2O3 2)CrO 3)CrO3 4)Cr
10. In the SCl6 compound, the oxidation states of sulfur and chlorine are respectively equal:
1) +6 and -1 2) -6 and +1 3) +3 and -2 4) +12 and -2
Answers:
10.1
Test task with an answer on the topic “Compounds of chemical elements. The degree of oxidation »are compiled in accordance with the mandatory minimum content of the main educational program of O.S. Gabrielyan for the course of chemistry of the 8th grade.
The test can be used to consolidate and test the knowledge of students, to prepare for the GIA, tests and tests.
On the topic: methodological developments, presentations and notes
The document contains a technological map of the lesson and describes the activities of the teacher and students during the lesson ...
The test is used to test students' knowledge on the topic "Initial chemical concepts. Atoms of chemical elements." This test is intended for students studying chemistry under the program of O.S. Gabriel ...
Substance formula | Oxidation state |
A) CH 2 FROMl 2 | 1) -4 |
B)HCHO | 2) -2 |
AT)HCOONa | 3) 0 |
G)CBr 4 | 4) +2 |
5) +4 |
|
2. Establish a correspondence between the formula of the compound and the value of the oxidation state of chlorine in it |
|
Substance formula | Oxidation state |
BUT)Ca(OCl) 2 | 1)+1 |
B)KClO 3 | 2)+2 |
AT)HClO 2 | 3)+3 |
G)FeCl 3 | 4)+5 |
5)-1 |
|
3. Establish a correspondence between the formulas of substances and the oxidation states of manganese |
|
Substance formula | Oxidation state |
BUT)MnSO 4 | 1) +1 |
B)Mn 2 O 7 | 2)+2 |
AT) K 2 MNO 4 | 3)+4 |
G) MnO 2 | 4) +6 |
5) +7 |
|
6) +8 |
|
4. Establish a correspondence between the formula of a substance and the degree of nitrogen in it |
|
Substance formula | Oxidation state |
BUT)(NH 4 ) 2 SO 4 | 1) -3 |
B) N 2 H 4 | 2) -2 |
AT) CH 3 NO 2 | 3) -1 |
G) KNO 3 | 4) +2 |
5) +3 |
|
6) +5 |
|
5. Establish a correspondence between the formula of a substance and the degree of oxidation of nitrogen in it. |
|
Formula | Oxidation state |
BUT)NOF | 1) -3 |
B) (SN 3 ) 2 NH | 2) -2 |
AT)NH 4 Br | 3) +2 |
G)N 2 H 4 | 4) +3 |
5) +4 |
|
6) +5 |
|
6. Establish a correspondence between the name of the chemical element and the possible values of its oxidation states. |
|
Element name | Oxidation states |
A) chlorine | 1) -2, -1, 0, +2 |
B) Fluorine | 2) -2, 0, +4, +6 |
B) Phosphorus | 3) -3, 0, +3, +5 |
D) Sulfur | 4) -1, 0 |
5) -1, 0, +1, +3, +5, +7 |
|
6) -4, -2, 0, +2, +4 |
|
7. Establish a correspondence between the formula of a substance and the degree of oxidation of carbon in it. |
|
Substance formula | Oxidation state |
BUT) CH 4 | 1) -4 |
B) NSON | 2) -2 |
AT) UNSD | 3) 0 |
G) CH3-OH | 4) +2 |
5) +4 |
|
8. Establish a correspondence between the formula of a substance and the oxidation state of chlorine in it |
|
Substance formula | Oxidation state of chlorine |
BUT)HCl | 1) -1 |
B)ClF 5 | 2) +1 |
AT)Cl 2 O | 3) +3 |
G)Cl 3 N | 4) +5 |
9. Establish a correspondence between the formula of a substance and the degree of oxidation of nitrogen in it |
|
Substance formula | The oxidation state of the nitrogen atom |
BUT) N 2 | 1) -3 |
B) H 2 N-NH 2 | 2) -2 |
AT) NH 3 | 3) 0 |
G) HNO 3 | 4) +5 |
10. Establish a correspondence between the formula of the ion and the oxidation state of the acid-forming element in it |
|
And he | The oxidation state of the acid-forming element |
BUT)Cr 2 O 7 2- | 1) +3 |
B)SO 3 2- | 2) +4 |
AT)P 2 O 7 4- | 3) +5 |
G)NO 2 - | 4) +6 |
11. Establish a correspondence between the formula of an ion and its ability to exhibit redox properties |
|
Ion formula | redox properties |
BUT)N 3- | 1) Only oxidizer |
B)HPO 3 2- | 2) Reductant only |
AT)SO 3 2- | 3) Both an oxidizing agent and a reducing agent |
G)C 4- | 4) Neither an oxidizing agent nor a reducing agent |
12. Establish a correspondence between the formula of the ion and the oxidation state of the acid-forming element in it |
|
And he | Phosphorus oxidation state |
A) RO 4 3– | 1) -3 |
B) N 2 R 2 O 7 2- | 2) +3 |
B) NRO 4 2- | 3) +4 |
The degree of oxidation of chemical elements. Tests. Part A. A1. The binary substance is: 1) HNO3 2) CO 3) NaOH 4) H2SO3 A2. The oxidation state of phosphorus in the compound P 2 O 5 is equal to: 1) -3 2)0 3) +5 4) +3 A3. The oxidation state +2 is typical for: 1) for metals of group 1 2) for metals of group 3 3) for metals of group 2 4) for non-metals of group 5 A4. Atoms in the molecules of simple substances and atoms in the free state have an oxidation state of 1) 0 2) -1 3) +1 4) +2 A5. What is the formula of a compound in which the elements have oxidation states +1 and -3? 1)PH 3 2)P 2 O 3 3)PF 3 4)K 3 P A6. Nitrogen has the lowest oxidation state in the compound: 1) NO 2 2)N 2 O 3 3)NH 3 4)N 2 0 A7. Chlorine has an oxidation state equal to zero in the compound: 1) NaCl 2) HCL 3) Cl 2 4)Cl 2 O 7 A8. In compound K 2 S oxidation state of sulfur is: 1) 0 2)+2 3)-2 4)-1 A9. Which line contains the formulas of compounds where chlorine is in the highest and lowest oxidation states: 1) HCL, NaCl 2) Cl 2 O 7, Cl 2 O 3) CL 2 O 3, HCL 4) KCl, Cl 2 O A10. In an OF connection 2 the degree of oxidation of oxygen is: 1) -2 2) -1 3)0 4) +2 Part B. B1.U match the formula of the substance and the degree of oxidation of nitrogen in them
Answer: A B C B2. Establish a correspondence between the formula of the substance and the oxidation state of chlorine in them
Formula |
1. Phosphorus atoms have the same oxidation state in the compounds P 2 O 5 and
1) H 3 PO 3 3) Mg 3 P 2
2) (NH 4) 3 PO 4 4) PH 3
2. The nitrogen atoms have the same oxidation state in the compounds N 2 O 3 and
1) KNO 3 3) Ca(NO 3) 2
2) (NH 4) 2 S 4) NH 3
3. The element has its highest oxidation state in oxide, the formula of which is
1) CaO 3) Cl 2 O
2) P 2 O 3 4) NO 2
4. Phosphorus has the lowest oxidation state in compounds
1) P 2 O 5 2) Mg 2 P 3 3) PCl 3 4) K 3 PO 3
5. Chlorine has the highest oxidation state in the compound
1) KClO 4 3) CaCl 2
2) Ca(ClO 3) 2 4) NH 4 Cl
6. The same oxidation state as silicon in Na 2 SiO 3 has sulfur in the compound
1) K 2 SO 4 2) (NH 4) 2 S 3) H 2 SO 3 4) Al 2 S 3
7. Carbon has the highest oxidation state in the compound
1) Al 4 C 3 2) CH 4 3) Na 4 C 4) CO 2
8. In which of the compounds is the oxidation state of sulfur equal to +4?
1) K 2 SO 3 2) H 2 SO 4 3) (NH 4) 2 S 4) Fe 2 (SO 4) 3
9. Nitrogen atoms have the same oxidation state in compounds
1) NH 4 Cl and NF 3 3) Ca 3 N 2 and KNO 3
2) NO 2 and NO 4) N 2 O 3 and HNO 2
10. The oxidation states of nitrogen and phosphorus in (NH 4) 3 PO 4 are respectively equal
1) +1 and +8 3) +3 and -5
2) -4 and +5 4) -3 and +5
