Chapter Exam

Unit 5: p-Block Elements — Online MCQ Test

Q: What is the electronic configuration of nitrogen in the ground state?

Answer: A. 1s2 2s2 2p3 — Nitrogen has atomic number 7, so its ground-state electronic configuration is 1s2 2s2 2p3.

Q: Which of the following elements belongs to Group 18?

Answer: B. Neon — Neon is a noble gas and is placed in Group 18 of the periodic table.

Q: The reason for the catenation tendency of Group 15 elements is mainly due to:

Answer: A. Small atomic size and strong E–E bond — Catenation is favored when atoms form strong covalent bonds with themselves, as seen prominently in lighter p-block elements.

Q: Select the correct order of acidic strength of oxoacids of chlorine:

Answer: A. HClO < HClO2 < HClO3 < HClO4 — Acid strength increases with the number of oxygen atoms because the conjugate base is better stabilized by resonance and the electron-withdrawing effect of oxygen.

Q: Which one of the following is NOT a noble gas compound known in chemistry?

Answer: C. NeF2 — Neon does not form stable compounds under normal chemical conditions, whereas xenon and krypton compounds are known.

CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 5: p-Block Elements with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY. This chapter covers: This chapter covers Group 15 16 17 and 18 elements electronic configurations property trends oxides oxoacids halides interhalogen compounds noble gas chemistry and industrial prepa.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 5: p-Block Elements — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY — Unit 5: p-Block Elements, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the electronic configuration of nitrogen in the ground state?

A. 1s2 2s2 2p3 ✓
B. 1s2 2s2 2p5
C. 1s2 2s2 2p4
D. 1s2 2s2 2p6

Answer: A. 1s2 2s2 2p3
Nitrogen has atomic number 7, so its ground-state electronic configuration is 1s2 2s2 2p3.

Which of the following elements belongs to Group 18?

A. Chlorine
B. Neon ✓
C. Phosphorus
D. Sulfur

Answer: B. Neon
Neon is a noble gas and is placed in Group 18 of the periodic table.

The reason for the catenation tendency of Group 15 elements is mainly due to:

A. Small atomic size and strong E–E bond ✓
B. High electronegativity only
C. Presence of d-orbitals in all members
D. Only metallic character

Answer: A. Small atomic size and strong E–E bond
Catenation is favored when atoms form strong covalent bonds with themselves, as seen prominently in lighter p-block elements.

Select the correct order of acidic strength of oxoacids of chlorine:

A. HClO < HClO2 < HClO3 < HClO4 ✓
B. HClO4 < HClO3 < HClO2 < HClO
C. HClO2 < HClO < HClO4 < HClO3
D. HClO3 < HClO4 < HClO < HClO2

Answer: A. HClO < HClO2 < HClO3 < HClO4
Acid strength increases with the number of oxygen atoms because the conjugate base is better stabilized by resonance and the electron-withdrawing effect of oxygen.

Which one of the following is NOT a noble gas compound known in chemistry?