CBSE Class 12 Chemistry D and F Block Exam Notes

Read and download free pdf of CBSE Class 12 Chemistry D and F Block Exam Notes. Students and teachers of Class 12 Chemistry can get free advanced study material, revision notes, sure shot questions and answers for Class 12 Chemistry prepared as per the latest syllabus and examination guidelines in your school. Standard 12 students should download this study material which will give them more knowledge for all chapters in Chemistry and all important topics which are scoring and can get you more marks. Students should also download free pdf of Chapter wise Notes for Class 12 Chemistry prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this year and also download free worksheets and question papers available here to get higher scores in school exams and tests, also click here for more Study Material for Class 12 Chemistry

CBSE Class 12 Chemistry D and F Block Exam Notes. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

Q1.What are d-Block elements?
Ans.These are those elements in which the last electron enter the d-subshell.

Q2.Why are d-block elements called transition elements?
Ans.Because in this block the elements lie between s and p block i.e., between group 12 and group 13.

Q3.Give the general electronic configuration of d-block elements.
Ans.(n – 1)d1–10 ns1– 2

Q4.Name the 3 series of transition elements.
Ans.(i)3d series
First transition series. Has 10 elements from scandium (Sc) to Zinc (Zn)
(ii)4d series
Second transition series. Has 10 elements from Yttium (Y) to cadmium (Cd)
(iii)5d series
Third transition series. Has 10 elements from Lanthanium (La) to mercury (Hg)

Q5.Which is the most commonly known feature/characteristic of d-block elements.
Ans.It is the presence of un paired electrons in the d-orbitals ; i.e., incompletely set of d-orbitals.

Q6.Why Zn, Hg and Cd often not regarded as transition elements.
Ans.Being the end members of their respective transition series, their configuration is generally given by (n – 1) d10 ns2 i.e., these elements have completely filled d-orbitals and hence do not fulfill the general characteristic of d-block elements which the pressence of incompletely filled d-orbital. Hence are not regarded as transition elements.

Q7.On what grounds you can say that Scandium (Z = 21) is a transition elements but Zn is not?
Ans.Electronic configuration of Sc (Z = 21) 

1s2 2s2 2p6 3s2 3p6 4s2 3d1 

Electronic configuration of Zn (t =30) 

1s2 2s2 2p6 3s2 3p6 4s2 3d10 

We can say this on the basis of filling of d orbitals. Sc fulfills the general condition of d-block due to presence of incompletely filled d-orbitals (Presence of unpaired electrons) whereas zinc does not as it has completely filled of orbital.

Q8.Why does Ionic size or atomic size decrease in any transition series ?
Ans.As were move left in the transition series the nuclear charge increase by one unit and the additional e goes into the inner d-orbital and since d es are poor shielded so they high effective nuclear charge and attracted towards the nucleus due to which decrease in atomic and ionic radius is observed.

Q9.Why do transition metals show variable oxidation states?
Ans.This is because the outer ns electrons also participate with the inner (n – 1)d electrons in bond as their energies are same. And also due to presence of incompletely filled d-orbitals so diff no. of electrons can be lost by atoms.

Please click on below link to download pdf file for CBSE Class 12 Chemistry D and F Block Exam N

Tags: 

 


Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

ICSE Board Exams Cancelled

The ICSE (Class X) 2021 Examination: Given the present worsening situation of the Covid- 19 Pandemic in the country, the CISCE has decided to CANCEL the ICSE (Class X) 2021 Examination. The options given in the earlier Circular dated 16th April 2021, now stands...

CBSE asks schools to load Class 12 Internal Assessment Marks

This has a reference to the letter no CBSE/COORD/2021 dated 11.02.2021 regarding conduct of the School-Based Assessment (Internal Assessment/Practical/ Project) of Class-XII and uploading the marks by 11.06.2021. It has been observed that some schools have not been...

FAQs on Policy for Tabulation of Marks for Class 10 Board Exams

ON POLICY Question.1 How CBSE will declare the result of Class-X? Answer. Results of Class X Board will be declared on the basis of an objective criterion developed by the Board vide Notification no.CBSE/CE/2021 dated 01.05.2021. Question.2. If any candidate is not...

CBSE Assessment Framework

The Central Board of Secondary Education (CBSE) today, announced a suggested competency-based assessment framework to strengthen India’s existing school education system for secondary level (classes 6-10) and improve the overall learning outcomes of students across...

Time management for CBSE students

The first thing to learn about Time Management is that time is theoretical so you can’t really manage it. What you do when you get into time management, is that you manage yourself. You decide what has to be done, when it must be done and how to do it in the stipulated...

Class 10 Boards Cancelled Class 12 postponed

Looking to the present situation of the pandemic and school closures, and also taking in account the safety and well-being of the students, it is decided as follows:   1. The Board Exams for Class XIIth to be held from May 4th to June, 14th, 2021 are hereby postponed....

×
Studies Today