CBSE Class 12 Chemistry P Block Elements Board Exam Notes

Download CBSE Class 12 Chemistry P Block Elements Board Exam Notes in PDF format. All Revision notes for Class 12 Chemistry have been designed as per the latest syllabus and updated chapters given in your textbook for Chemistry in Class 12. Our teachers have designed these concept notes for the benefit of Class 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Chemistry for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Chemistry given on studiestoday

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

Class 12 Chemistry students should refer to the following concepts and notes for Unit 07 The p-Block Elements in Class 12. These exam notes for Class 12 Chemistry will be very useful for upcoming class tests and examinations and help you to score good marks

Unit 07 The p-Block Elements Notes 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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CBSE Class 12 Chemistry Unit 07 The p-Block Elements Notes

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