TAMILNADU COMPETITIVE EXAMS

Important notes on Preparation and Properties of K 2 Cr 2 O 7 In this article we are providing the keynotes to cover the one of the important compounds from the topic: Properties of D and F block elements in just 10 points. In the previous article we discussed about the Physical properties of D-block elements (A) Potassium dichromate (K 2 Cr 2 O 7 ):  1. It is an inorganic chemical reagent and is used as an oxidizing agent in various health and industry-related problems (mainly used to oxidize alcohols 2. It is acutely and chronically harmful to health. 3. It is a crystalline ionic solid with a very bright, red-orange color and is moderately soluble in cold water but freely soluble in hot water. 4. It has a triclinic geometry with a tetrahedral coordination geometry. 5. Preparation: It is prepared from chromite ore (FeCr2O4). This preparation involves many steps: i. Preparation of Sodium Chromate Chromite ore is finely powdered and is he...

Physical Properties of D block elements Per iodic table 1. The d-block elements are also called as Transition elements. And the f-block elements are called as the inner-transition elements.  2. The d-block elements are found in the groups 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 of the periodic table. There is a special name given to the period 6 and 7 called as Lanthanide and Actinide series  3. These are called d-block elements, because there last electron enters the d-shell. The number of valence electrons is a d-sub shell are 10. 4. There are mainly four series namely :3d series (Ist series) - From Sc to Zn : 4d series (IInd series) - From Y to Cd : 5d series (IIIrd series) - From La to Hg (excluding Ce to Lu) : 6d series (IVth series) - Starting from Ac 5. The electronic configuration of d-block elements is (n-1)d ns . The (n–1) stands for the inner d orbitals which may have one to ten electrons and the outermost ns orbital may have one or two electrons. ...