Q. What is the atomic number of sodium (Na)?
Solution
The atomic number of sodium (Na) is 11.
Correct Answer:
A
— 11
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Q. What is the common oxidation state of alkali metals?
Solution
Alkali metals have a common oxidation state of +1.
Correct Answer:
A
— +1
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Q. What is the formula for the compound formed between magnesium and chlorine?
-
A.
MgCl
-
B.
MgCl2
-
C.
Mg2Cl
-
D.
Mg2Cl2
Solution
The formula for the compound formed between magnesium and chlorine is MgCl2.
Correct Answer:
B
— MgCl2
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Q. What is the molar mass of potassium (K)?
-
A.
39 g/mol
-
B.
40 g/mol
-
C.
41 g/mol
-
D.
42 g/mol
Solution
The molar mass of potassium (K) is approximately 39 g/mol.
Correct Answer:
A
— 39 g/mol
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Q. What is the primary use of barium sulfate (BaSO4)?
-
A.
As a fertilizer
-
B.
In X-ray imaging
-
C.
In fireworks
-
D.
As a lubricant
Solution
Barium sulfate (BaSO4) is primarily used in X-ray imaging as a contrast agent.
Correct Answer:
B
— In X-ray imaging
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Q. Which of the following compounds is formed when sodium reacts with water?
-
A.
NaOH
-
B.
Na2O
-
C.
NaCl
-
D.
NaH
Solution
Sodium reacts with water to form sodium hydroxide (NaOH) and hydrogen gas.
Correct Answer:
A
— NaOH
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Q. Which of the following is a characteristic property of alkaline earth metals?
-
A.
They are highly reactive
-
B.
They form basic oxides
-
C.
They are gases at room temperature
-
D.
They have low densities
Solution
Alkaline earth metals typically form basic oxides.
Correct Answer:
B
— They form basic oxides
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Q. Which of the following s-block elements is a liquid at room temperature?
-
A.
Lithium
-
B.
Sodium
-
C.
Potassium
-
D.
Mercury
Solution
Mercury is the only liquid metal at room temperature, while all s-block elements are solid.
Correct Answer:
D
— Mercury
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Q. Which of the following s-block elements is used in fireworks for producing a bright red color?
-
A.
Lithium
-
B.
Sodium
-
C.
Potassium
-
D.
Calcium
Solution
Lithium is used in fireworks to produce a bright red color.
Correct Answer:
A
— Lithium
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Q. Which s-block element has the highest melting point?
-
A.
Lithium
-
B.
Sodium
-
C.
Potassium
-
D.
Rubidium
Solution
Lithium has the highest melting point among the alkali metals.
Correct Answer:
A
— Lithium
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