CBSE Class 12 Chemistry D And F Block Elements Board Exam Notes

 d‐block consists of elements belonging to group 3‐12.
 The general electronic configuration of these elements in (n‐1) d1–10 ns1–2. They contain unpaired d - electron either in elementary or most commonly occurring oxidation state.
 Transition elements exhibits metallic character, high densities, high melting and boiling point due to strong interatomic interaction between partially filled d - orbits.'
 Transition elements show variable oxidation state due to small energy difference between (n‐1)d & ns orbitals.
 Transition metals show colour due to presence of unpaired electron in (n‐1)d orbital of penultimate shell which undergoes d‐d transition generally
 Transition metal elements are paramagnetic due to presence of unpaired e .
 Most of transition form complex compounds due to
(I) small size
(ii) high charge
(iii) presence of vacant d‐orbital of suitable energy.
 
 Transition elements have lower value of reduction potential due to high ionization potential, high heat of sublimation and low enthalpy of hydration.
 Transition elements form interstitial compounds because as small atoms like C, N, O, H. occupy the voids and get bonded to the atom of transition metals.
 Transition elements form alloys due to similar ionic radii as they can mutually substitute their position in the crystal lattice.
 The oxides of transition metals in lower oxidation states are basic, intermediate oxidation states are amphoteric, highest oxidation state are acidic.
 The highest oxidation state of an element is equal to no. of unpaired electrons present in (n‐1)d & ns orbitals.


Please click the link below to download pdf file of CBSE Class 12 Chemistry D and F Block Elements Board Exam Notes


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

CBSE Decision on Board Exam 2020

The Class 10 and 12 exams are cancelled, and results for both 10th and 12th would be declared by July 15 based on internal exams. CBSE Class 12 students would have the option to appear for the exams at a later date. CBSE has a scheme in which marks scored in past 3...

Art Integrated Project work for classes 1 to 10

CBSE Board has decided to introduce Art-Integrated Project work for classes I to X to promote Art-Integrated Learning in schools to make teaching learning Competency-Based and joyful. As part of this, at least one Art-Integrated Project in each subject shall be taken...

CBSE advisory on student marks

CBSE has issued a public advisory for all students to be careful from unscrupulous persons impersonating themselves as officers/officials of CBSE. These people have been contacting parents and have been telling them that they have access to student marks data for Board...

Board Exams Class 10 and 12 Notification by CBSE

Because of the prevailing condition of spread of COVID-19 pandemic in the country, special efforts are required for conducting examinations in a safe manner. As a number of students have shifted from the district of their school to some other district in the country,...

Class 12 Board Exams Datesheet Announced

CBSE has announced the datesheet of the remaining class 12 board exams, see below:  

Procedure for correction in Name and Date of Birth

Procedure for correction in Name and Date of Birth in CBSE records Name Change: Applications regarding changes in name or surname of candidates will be considered provided the changes have been admitted by the Court of law and notified in the Government Gazette before...

×
Studies Today