Q. What is the common oxidation state of alkali metals?
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Solution
Alkali metals have a common oxidation state of +1.
Correct Answer:
A
— +1
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Q. What is the electron configuration of Magnesium?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p¹
C.
1s² 2s² 2p⁶ 3s² 3p²
D.
1s² 2s² 2p⁶ 3s² 3d¹
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Solution
The electron configuration of Magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s²
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Q. What is the electron configuration of potassium (K)?
A.
1s² 2s² 2p⁶ 3s¹
B.
1s² 2s² 2p⁶ 3s²
C.
1s² 2s² 2p⁶ 3s² 3p¹
D.
1s² 2s² 2p⁶ 3s² 3p²
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Solution
The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s¹
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Q. What is the electron configuration of the alkali metal potassium (K)?
A.
1s² 2s² 2p⁶ 3s¹
B.
1s² 2s² 2p⁶ 3s²
C.
1s² 2s² 2p⁶ 3s² 3p¹
D.
1s² 2s² 2p⁶ 3s² 3p²
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Solution
The electron configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s¹
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Q. What is the electron configuration of the alkaline earth metal magnesium?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p²
C.
1s² 2s² 2p⁶ 3s² 3p⁶
D.
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
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Solution
The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s²
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Q. What is the electron configuration of the element with atomic number 12?
A.
1s2 2s2 2p6 3s2
B.
1s2 2s2 2p6 3s2 3p1
C.
1s2 2s2 2p6 3s2 3p6
D.
1s2 2s2 2p6 3s2 3d10
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Solution
The element with atomic number 12 is Magnesium (Mg) with the configuration 1s2 2s2 2p6 3s2.
Correct Answer:
A
— 1s2 2s2 2p6 3s2
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Q. What is the electron configuration of the s-block element magnesium?
A.
1s² 2s² 2p⁶ 3s²
B.
1s² 2s² 2p⁶ 3s² 3p¹
C.
1s² 2s² 2p⁶ 3s² 3p²
D.
1s² 2s² 2p⁶ 3s² 3d¹
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Solution
The electron configuration of magnesium (Mg) is 1s² 2s² 2p⁶ 3s².
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s²
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Q. What is the electronic configuration of the alkali metal potassium (K)?
A.
1s² 2s² 2p⁶ 3s¹
B.
1s² 2s² 2p⁶ 3s²
C.
1s² 2s² 2p⁶ 3s² 3p¹
D.
1s² 2s² 2p⁶ 3s² 3p⁶
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Solution
The electronic configuration of potassium (K) is 1s² 2s² 2p⁶ 3s¹.
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s¹
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Q. What is the formula of the compound formed between magnesium and chlorine?
A.
MgCl
B.
MgCl2
C.
Mg2Cl
D.
Mg2Cl2
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Solution
The formula of the compound formed between magnesium and chlorine is MgCl2.
Correct Answer:
B
— MgCl2
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Q. What is the formula of the compound formed when magnesium reacts with oxygen?
A.
MgO
B.
Mg2O3
C.
MgO2
D.
Mg3O2
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Solution
Magnesium reacts with oxygen to form magnesium oxide, which has the formula MgO.
Correct Answer:
A
— MgO
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Q. What is the general trend in the melting points of alkali metals as you move down the group?
A.
They increase
B.
They decrease
C.
They remain constant
D.
They fluctuate
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Solution
The melting points of alkali metals generally decrease as you move down the group due to the increase in atomic size and decrease in metallic bonding strength.
Correct Answer:
B
— They decrease
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Q. What is the primary product when magnesium reacts with dilute hydrochloric acid?
A.
Magnesium chloride
B.
Hydrogen gas
C.
Magnesium hydroxide
D.
Magnesium oxide
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Solution
The primary products of the reaction between magnesium and dilute hydrochloric acid are magnesium chloride (MgCl2) and hydrogen gas (H2).
Correct Answer:
A
— Magnesium chloride
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Q. What is the primary reason for the high reactivity of alkali metals?
A.
High electronegativity
B.
Low ionization energy
C.
High atomic radius
D.
Presence of d-orbitals
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Solution
Alkali metals have low ionization energy, which contributes to their high reactivity.
Correct Answer:
B
— Low ionization energy
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Q. What is the primary reason for the increasing reactivity of alkali metals down the group?
A.
Increasing atomic size
B.
Decreasing ionization energy
C.
Increasing electronegativity
D.
Increasing metallic character
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Solution
The reactivity of alkali metals increases down the group due to decreasing ionization energy.
Correct Answer:
B
— Decreasing ionization energy
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Q. What is the primary use of barium sulfate?
A.
As a contrast agent in X-ray imaging
B.
In fireworks
C.
As a fertilizer
D.
In batteries
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Solution
Barium sulfate is primarily used as a contrast agent in X-ray imaging.
Correct Answer:
A
— As a contrast agent in X-ray imaging
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Q. What is the primary use of calcium in the industry?
A.
As a reducing agent
B.
In the production of cement
C.
In batteries
D.
As a fertilizer
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Solution
Calcium is primarily used in the production of cement.
Correct Answer:
B
— In the production of cement
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Q. What is the primary use of potassium in agriculture?
A.
Fertilizer
B.
Pesticide
C.
Herbicide
D.
Soil conditioner
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Solution
Potassium is primarily used as a fertilizer in agriculture.
Correct Answer:
A
— Fertilizer
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Q. What is the primary use of sodium bicarbonate?
A.
Baking
B.
Medicine
C.
Cleaning
D.
All of the above
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Solution
Sodium bicarbonate is used in baking, medicine, and cleaning.
Correct Answer:
D
— All of the above
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Q. What is the trend in atomic radius as you move down the group of alkali metals?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies irregularly
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Solution
The atomic radius increases as you move down the group of alkali metals.
Correct Answer:
A
— Increases
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Q. What is the trend in ionization energy as you move down the group in s-block elements?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies irregularly
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Solution
Ionization energy decreases as you move down the group in s-block elements due to increased atomic size.
Correct Answer:
B
— Decreases
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Q. What is the trend in ionization energy for alkali metals down the group?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Fluctuates
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Solution
Ionization energy decreases down the group for alkali metals.
Correct Answer:
B
— Decreases
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Q. What is the typical charge of s-block metal ions?
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Solution
S-block metals typically form ions with a charge of +2.
Correct Answer:
B
— +2
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Q. Which alkaline earth metal is least reactive?
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Barium
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Solution
Beryllium (Be) is the least reactive alkaline earth metal.
Correct Answer:
A
— Beryllium
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Q. Which alkaline earth metal is most reactive?
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Barium
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Solution
Barium is the most reactive alkaline earth metal due to its larger atomic size and lower ionization energy.
Correct Answer:
D
— Barium
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Q. Which alkaline earth metal is the least reactive?
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Strontium
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Solution
Beryllium is the least reactive alkaline earth metal due to its high ionization energy.
Correct Answer:
A
— Beryllium
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Q. Which alkaline earth metal is used in fireworks for producing a red color?
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Strontium
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Solution
Strontium is used in fireworks to produce a red color.
Correct Answer:
D
— Strontium
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Q. Which alkaline earth metal is used in fireworks for producing a red flame?
A.
Beryllium
B.
Magnesium
C.
Calcium
D.
Strontium
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Solution
Strontium is used in fireworks to produce a red flame.
Correct Answer:
D
— Strontium
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Q. Which alkaline earth metal is used in the production of fireworks?
A.
Calcium
B.
Strontium
C.
Barium
D.
Magnesium
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Solution
Strontium is used in fireworks to produce red colors.
Correct Answer:
B
— Strontium
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Q. Which of the following compounds is formed by an s-block element?
A.
NaCl
B.
CO2
C.
H2O
D.
NH3
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Solution
NaCl is formed by sodium, which is an s-block element.
Correct Answer:
A
— NaCl
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Q. Which of the following compounds is formed when sodium reacts with water?
A.
Sodium hydroxide
B.
Sodium oxide
C.
Sodium bicarbonate
D.
Sodium chloride
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Solution
Sodium reacts with water to form sodium hydroxide (NaOH) and hydrogen gas.
Correct Answer:
A
— Sodium hydroxide
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Showing 1 to 30 of 54 (2 Pages)
s-block Elements MCQ & Objective Questions
The s-block elements are fundamental to understanding chemistry, especially for students preparing for school and competitive exams. Mastering these elements through MCQs and objective questions is crucial for scoring well. By practicing s-block Elements MCQ questions, students can enhance their concept clarity and improve their exam readiness.
What You Will Practise Here
Key characteristics of s-block elements
Trends in atomic and ionic radii
Common oxidation states and reactivity patterns
Important compounds and their properties
Applications of s-block elements in real life
Diagrams illustrating group trends
Formulas related to s-block elements
Exam Relevance
The s-block elements are frequently featured in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of group properties, reactivity, and applications. Common question patterns include multiple-choice questions that require students to identify properties, predict reactions, or solve numerical problems related to s-block elements.
Common Mistakes Students Make
Confusing the properties of alkali metals with alkaline earth metals
Overlooking the significance of periodic trends
Misunderstanding the stability of oxidation states
Neglecting to relate s-block elements to their practical applications
FAQs
Question: What are s-block elements?Answer: s-block elements include the alkali metals and alkaline earth metals, which are found in Groups 1 and 2 of the periodic table.
Question: Why are s-block elements important for exams?Answer: They form the basis of many chemical reactions and concepts, making them essential for understanding advanced chemistry topics.
Start solving practice MCQs on s-block elements today to test your understanding and boost your confidence for upcoming exams!
