Chapter Exam

Unit 9: s-Block Elements — Online MCQ Test

Q: Which of the following elements belongs to Group 1 (alkali metals)?

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.

Q: The general valence electronic configuration of alkaline earth metals is:

Answer: B. ns2 — Group 2 elements have two electrons in their outermost s-orbital, so their general valence configuration is ns2.

Q: The anomalous behavior of lithium among alkali metals is mainly due to its:

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.

CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 9: s-Block Elements with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY. 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.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 9: s-Block Elements — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY — Unit 9: s-Block Elements, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

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.