CBSE Class 12 Chemistry P Block Elements Board Exam Notes

Here is the CBSE Class 12 Chemistry P Block Elements Board Exam Notes for your studies. Use these Class 12 Chemistry revision notes, created by professional educators for the 2026-27 academic term. They make difficult ideas very easy to understand and focus on core definitions, helping Class 12 students prepare quickly before exams.

Key Concepts & Revision: Class 12 Chemistry Unit 07 The p-Block Elements

Every Class 12 Chemistry student can review these Unit 07 The p-Block Elements notes to grasp main concepts quickly. The exam-friendly summaries highlight hard sections and high-scoring areas to make school assessments and final tests much easier.

Unit 07 The p-Block Elements Revision Notes for Class 12 Chemistry

The general valence shell electronic configuration of p‐block elements ‐ ns2 np1–6
 
Group‐16thELEMENTS
 
KEY POINTS :‐
 
1. O, S, Se, Te and Po are present in G‐16th Their general electronic conf. of last shell is ns2,np4.
2. Atomic and ionic radii increases down the group while ionization enthalpy and electro-negativity decreases with increase in atomic number.
3. Because of compact nature of oxygen atom, it has less negative electron gain enthalpy than sulphur. However from sulphur onwards the value again becomes less negative up to polonium..
4. Members of group 16 show oxidation number ‐2, +2, +4 and +6. But oxygen shows +1 state in O2F2.
5. They make MO2 and MO3 type oxides. SO2 is reducing agent whereas TeO2 is oxidizing agent.
6. O2 is gas a n d other elements are solid.
7. O2 and S2 in vapour state are paramagnetic.

8. CONTACT PROCESS OF MANUFACTURE OF SULPHURIC ACID:‐

 

CBSE Class 12 Chemistry P Block Elements Board Exam Notes

 

QUESTIONS
 
1) Sulphur has more tendency to show catenation than oxygen
Ans.) Due to stronger S‐S bond and due to small size and greater interelectronic repulsion O‐O bond is weakened so it can't show catenation.
 
2) Oxygen is a gas but sulphur is a solid .

CBSE Class 12 Chemistry P Block Elements Board Exam Notes-1

 

4.) H2S is more acidic than H2O
Ans.) Bond dissociation enthalpy of S‐H bond is lesser than O‐H bond due to bigger size of sulphur.
 
5.) OF6 compound is not known, why?
Ans.) Due to the absence of d‐orbital in oxygen, it can't make OF6.

CBSE-Class-12-Chemistry-P-Block-Elements-Board-Exam-Notes

CBSE-Class-12-Chemistry-P-Block-Elements-Board-Exam-Notes

CBSE-Class-12-Chemistry-P-Block-Elements-Board-Exam-Notes

CBSE-Class-12-Chemistry-P-Block-Elements-Board-Exam-Notes

 

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Revision Notes & Key Concepts for Class 12 Chemistry Unit 07 The p-Block Elements

Download Chapter Notes: Class 12 Chemistry Unit 07 The p-Block Elements

Utilize these Revision Notes for Unit 07 The p-Block Elements to accelerate your exam readiness. Formatted under recent CBSE guidelines for Class 12, these summaries focus on critical curriculum components. Regular revision of these core points leads to superior performance in school tests.

Important Chapter Summary & Solutions for Unit 07 The p-Block Elements

Compiled directly from the official NCERT book for Class 12 Chemistry, these notes offer reliable academic support. Following your chapter summary review, our educators recommend checking our detailed NCERT solutions for Class 12 to compare your understanding, helping build a strong foundation in Chemistry.

Master Class 12 Chemistry with Extra Practice Sets

To excel in your evaluations, learners should also tackle the MCQ questions and practice worksheets available on this page. These additional solved exercises verify your mastery over Unit 07 The p-Block Elements concepts. Every learning aid online is free and synchronized with current Chemistry exam trends. Reviewing these revision notes daily builds confidence and drives better scores.

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