Unit 5: p-Block Elements — Online MCQ Test
CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 5: p-Block Elements with a free chapter-wise online MCQ test.
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....
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Unit 5: p-Block Elements — Important Questions & Answers
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.
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.
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.
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.
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?
- A. XeF2
- B. XeO3
- C. NeF2
- D. KrF2
Answer: C. NeF2
Neon does not form stable compounds under normal chemical conditions, whereas xenon and krypton compounds are known.
Neon does not form stable compounds under normal chemical conditions, whereas xenon and krypton compounds are known.