Kim loại Kiềm và Kiềm thổ Practice Questions
THPT (Vietnam) · THPT Hóa học · 139 free MCQs with instant results and detailed explanations.
139
Total
43
Easy
70
Medium
26
Hard
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Sample Questions from Kim loại Kiềm và Kiềm thổ
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Q1
Easy
When magnesium reacts with hydrochloric acid, which product is formed?
A.
Magnesium chloride
B.
Magnesium sulfate
C.
Magnesium oxide
D.
Magnesium hydroxide
Show Answer & Explanation
Correct Answer: A
When magnesium reacts with hydrochloric acid, the products are magnesium chloride and hydrogen gas. Magnesium chloride is a salt formed from this reaction.
Q2
Easy
Which of the following statements about alkaline earth metals is correct?
A.
They are all gases at room temperature.
B.
They have a higher melting point than alkali metals.
C.
They are more reactive than alkali metals.
D.
They exist only in their pure elemental forms.
Show Answer & Explanation
Correct Answer: B
Alkaline earth metals have higher melting points than alkali metals due to stronger metallic bonds resulting from the presence of two valence electrons, which contributes to greater stabilization in solid form.
Q3
Easy
Which of the following metals is classified as an alkali metal?
A.
Sodium
B.
Calcium
C.
Magnesium
D.
Barium
Show Answer & Explanation
Correct Answer: A
Sodium is an alkali metal found in Group 1 of the periodic table, known for its high reactivity, especially with water.
Q4
Medium
Which of the following metals is a representative of the alkaline earth metals group?
A.
Sodium
B.
Calcium
C.
Potassium
D.
Aluminum
Show Answer & Explanation
Correct Answer: B
Calcium is an alkaline earth metal, while sodium and potassium are alkali metals. Aluminum is a post-transition metal, not in the alkaline earth group.
Q5
Medium
When alkali metals react with water, what type of reaction is primarily observed?
A.
Reduction
B.
Double displacement
C.
Single displacement
D.
Combustion
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Correct Answer: C
The reaction of alkali metals with water is a single displacement reaction, where the metal displaces hydrogen from water, forming hydroxides and hydrogen gas.
Q6
Medium
Which alkaline earth metal is known for having the highest melting point?
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Strontium
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Correct Answer: A
Beryllium has the highest melting point among the alkaline earth metals due to its small atomic size and strong metallic bonds.
Q7
Medium
Which of the following compounds would be the least soluble in water?
A.
Sodium chloride
B.
Calcium sulfate
C.
Potassium bromide
D.
Lithium nitrate
Show Answer & Explanation
Correct Answer: B
Calcium sulfate is known to have low solubility in water compared to the other compounds listed, which are all highly soluble.
Q8
Hard
Which of the following statements correctly describes the reactivity trend of alkali metals in water?
A.
Reactivity increases down the group due to decreasing ionization energy.
B.
Reactivity decreases down the group due to increasing atomic size.
C.
Reactivity remains constant down the group.
D.
Reactivity increases up the group due to increased electronegativity.
Show Answer & Explanation
Correct Answer: A
Reactivity increases down the group of alkali metals because the ionization energy decreases, allowing the metals to lose their outermost electron more easily when reacting with water.
Q9
Hard
When magnesium reacts with hydrochloric acid, what is the primary product formed?
A.
Magnesium chloride and hydrogen gas
B.
Magnesium oxide and water
C.
Magnesium hydroxide and chlorine gas
D.
Magnesium sulfate and carbon dioxide
Show Answer & Explanation
Correct Answer: A
The reaction of magnesium with hydrochloric acid produces magnesium chloride (MgCl2) and hydrogen gas (H2) as the main products, according to the reaction equation Mg + 2HCl → MgCl2 + H2.
Q10
Hard
Which of the following statements about alkaline earth metals is correct?
A.
They readily lose two electrons to form +2 cations.
B.
They are less reactive than alkali metals.
C.
They readily form covalent bonds with non-metals.
D.
They have a higher density than all alkali metals.
Show Answer & Explanation
Correct Answer: A
Alkaline earth metals lose two electrons to achieve stable electron configurations, forming +2 cations. This is a key characteristic, differentiating them from alkali metals, which lose one electron.
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Kim loại Kiềm và Kiềm thổ — THPT (Vietnam) THPT Hóa học Practice Questions Online
This page contains 139 practice MCQs for the chapter Kim loại Kiềm và Kiềm thổ in THPT (Vietnam) THPT Hóa học. The questions are organized by difficulty — 43 easy, 70 medium, 26 hard — so you can choose the right level for your preparation.
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