Unit 9: s-Block Elements — Online MCQ Test
CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 9: s-Block Elements with a free chapter-wise online MCQ test.
This chapter covers: Focusing on group 1 alkali metals and group 2 alkaline earth metals this chapter covers electronic configurations physical chemical trends and anomalous behaviors. Students examine....
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Unit 9: s-Block Elements — Important Questions & Answers
Which of the following elements belongs to Group 1 (alkali metals)?
- A. Magnesium
- B. Sodium
- C. Calcium
- D. Barium
Answer: B. Sodium
Sodium is an alkali metal and belongs to Group 1 of the periodic table. Magnesium, calcium, and barium are Group 2 elements.
Sodium is an alkali metal and belongs to Group 1 of the periodic table. Magnesium, calcium, and barium are Group 2 elements.
The general valence electronic configuration of alkaline earth metals is:
- A. ns1
- B. ns2
- C. np1
- D. ns2np1
Answer: B. ns2
Group 2 elements have two electrons in their outermost s-orbital, so their general valence configuration is ns2.
Group 2 elements have two electrons in their outermost s-orbital, so their general valence configuration is ns2.
Which of the following is the correct reason for the high reactivity of alkali metals?
- A. They have very high electron affinity
- B. They have one electron in the outermost shell and low ionization enthalpy
- C. They have very small atomic radii and strong nuclear attraction
- D. They are nonmetals
Answer: B. They have one electron in the outermost shell and low ionization enthalpy
Alkali metals react readily because they can lose their single valence electron easily due to low ionization enthalpy. This makes them highly electropositive.
Alkali metals react readily because they can lose their single valence electron easily due to low ionization enthalpy. This makes them highly electropositive.
The anomalous behavior of lithium among alkali metals is mainly due to its:
- A. largest atomic size
- B. high hydration enthalpy and small size
- C. lowest electronegativity in the group
- D. filled p-orbitals
Answer: B. high hydration enthalpy and small size
Lithium differs from other alkali metals because of its very small size and high hydration enthalpy. These factors cause properties such as greater covalent character in its compounds.
Lithium differs from other alkali metals because of its very small size and high hydration enthalpy. These factors cause properties such as greater covalent character in its compounds.
Which statement is correct regarding the solubility and thermal stability of Group 2 carbonates?
- A. Both solubility and thermal stability decrease down the group
- B. Both solubility and thermal stability increase down the group
- C. Solubility increases but thermal stability decreases down the group
- D. Solubility decreases but thermal stability increases down the group
Answer: D. Solubility decreases but thermal stability increases down the group
For Group 2 carbonates, solubility generally decreases down the group, while thermal stability increases due to increasing cation size and decreasing polarizing power.
For Group 2 carbonates, solubility generally decreases down the group, while thermal stability increases due to increasing cation size and decreasing polarizing power.