Sắt và Hợp chất Practice Questions
THPT (Vietnam) · THPT Hóa học · 150 free MCQs with instant results and detailed explanations.
150
Total
50
Easy
67
Medium
33
Hard
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Sample Questions from Sắt và Hợp chất
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Q1
Easy
Which of the following is a common oxidation state of iron in its compounds?
A.
0
B.
+3
C.
+2
D.
+5
Show Answer & Explanation
Correct Answer: B
Iron commonly exhibits an oxidation state of +3 in many of its compounds, such as iron(III) oxide (Fe2O3). Although +2 is also common, +3 is more prevalent in various iron salts.
Q2
Easy
What is the primary product when iron reacts with hydrochloric acid?
A.
Iron chloride
B.
Hydrogen gas
C.
Iron hydroxide
D.
Water
Show Answer & Explanation
Correct Answer: B
When iron reacts with hydrochloric acid, it primarily produces hydrogen gas (H2) and iron chloride (FeCl2 or FeCl3), making hydrogen gas the most notable byproduct.
Q3
Easy
Which of the following compounds contains iron in the +2 oxidation state?
A.
Fe2O3
B.
FeCl2
C.
Fe(NO3)3
D.
Fe(OH)3
Show Answer & Explanation
Correct Answer: B
FeCl2 is the compound where iron is in the +2 oxidation state. In Fe2O3 and Fe(NO3)3, iron is in the +3 state, while Fe(OH)3 also contains iron in the +3 state.
Q4
Medium
What is the primary oxidation state of iron in most of its compounds?
A.
0
B.
+2
C.
+3
D.
-1
Show Answer & Explanation
Correct Answer: C
Iron commonly exhibits a +3 oxidation state in its compounds, such as in iron(III) oxide (Fe2O3). This is more prevalent than the +2 state in various contexts.
Q5
Medium
Which of the following compounds contains iron in the +2 oxidation state?
A.
FeCl3
B.
FeO
C.
Fe2O3
D.
FeSO4
Show Answer & Explanation
Correct Answer: B
FeO is an iron oxide where iron is in the +2 oxidation state, as it consists of Fe2+ and O2- ions. The other options contain iron in higher oxidation states.
Q6
Medium
Which reaction shows the reduction of iron(III) ions to iron(II) ions?
A.
Fe3+ + 3e- → Fe
B.
Fe3+ + e- → Fe2+
C.
Fe2+ + 2e- → Fe
D.
Fe3+ → Fe2+ + e-
Show Answer & Explanation
Correct Answer: B
The reaction Fe3+ + e- → Fe2+ indicates the reduction of iron(III) ions to iron(II) ions by gaining an electron.
Q7
Medium
What is the chemical formula of the compound formed when iron(III) chloride reacts with sodium hydroxide?
A.
Fe(OH)3
B.
Fe(OH)2
C.
FeCl2
D.
NaCl
Show Answer & Explanation
Correct Answer: A
The reaction between iron(III) chloride (FeCl3) and sodium hydroxide (NaOH) produces iron(III) hydroxide, which is Fe(OH)3, as a precipitate.
Q8
Hard
Which of the following compounds is the most stable form of iron(III) oxide at room temperature?
A.
Fe2O3
B.
FeO
C.
Fe3O4
D.
Fe(OH)3
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Correct Answer: A
Fe2O3, also known as hematite, is the most stable form of iron(III) oxide at room temperature due to its thermodynamic stability compared to other forms.
Q9
Hard
In a reaction where iron(II) sulfate reacts with sodium hydroxide, what is the resulting product?
A.
Iron(II) hydroxide
B.
Iron(III) hydroxide
C.
Iron(II) oxide
D.
Iron(III) sulfate
Show Answer & Explanation
Correct Answer: A
When iron(II) sulfate reacts with sodium hydroxide, iron(II) hydroxide is formed as a precipitate, which is the expected reaction product.
Q10
Hard
Which iron compound contains the highest oxidation state of iron?
A.
Iron(II) oxide (FeO)
B.
Iron(III) oxide (Fe2O3)
C.
Ferric chloride (FeCl3)
D.
Iron(IV) oxide (FeO2)
Show Answer & Explanation
Correct Answer: D
Iron(IV) oxide (FeO2) contains iron in the +4 oxidation state, which is the highest among the given options. Other compounds feature iron in lower oxidation states.
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Sắt và Hợp chất — THPT (Vietnam) THPT Hóa học Practice Questions Online
This page contains 150 practice MCQs for the chapter Sắt và Hợp chất in THPT (Vietnam) THPT Hóa học. The questions are organized by difficulty — 50 easy, 67 medium, 33 hard — so you can choose the right level for your preparation.
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