TAMILNADU COMPETITIVE EXAMS

TIPS TO CRACK SHAPE OF THE MOLECULE: Are you feeling dejected in solving shapes of the chemical molecules? Then this article might help you But now the problem is how to find lone pair and bond pair... That is the next technique TRICK TO FIND L.P, B.P AND HYBRIDISATION Let's consider NH 3   as an example now. First find the central atom which had undergone hybridisation and find its outershell electrons and write as below:                 N •               •               •               •               • ( Nitrogen has 5 elecrons in its outermost shell and so five dots) Now three hybrogens are bonded to it.So write as below             N •─H               •...

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. ...

TRICKS FOR MAKING INORGANIC CHEMISTRY  LOVABLE 1. Just learn the word LERCMBS DORI . 2. You just remember the place of dotes because they are separated according to the different properties of groups as there is no dot present between CM you can see in 4 point the property CATENATION  and METAL METAL BOND ENERGY both properties for 4 Similarly is the case with DORI as this word represent Dipole moment, Oxidizing strength, Reactivity toward hydrogen, Ionic nature L .E.R.CM.B.S. DORI 1. L - Lattice energy of  metal halides = 1 group 2. Enthalpy of hydration = 2 group 3. Relative stability of +3 oxidation state in 3 group 4. Catenation property , metal metal bond energy = 4 group 5. Basicity of hydride = 5 group 6. Stability of halide = 6 group 7. Dipole moment Oxidizing strength Reactivity toward hydrogen Ionic nature All properties increase from top to bottom except these 2. TRICKS TO ESTIMATE THE PRODUCTS FORM WHEN COMPOUND IS HEATED Maximum time w...