Hence it is a colligative property. Group 17 Elements: General introduction, electronic configuration, oxidation states, occurrence, trends in physical and chemical properties; compounds of halogens, Preparation, properties and uses of Chlorine and Hydrochloric acid, interhalogen compounds, Oxoacids of halogens structures only. Also, these solutions teach how to best approach a problem and solve it quickly. One of the important feature of this book is the method of presenting contents before students. Also ii Calculate the vapor pressure of water at 298K Answer 2. From industrial point of view, it is essential to give information regarding few areas like Plastic industry — is used for making buckets, mugs, soap, shoes, ropes etc.
Uses of Argon gas: i Argon along with nitrogen is used in gas-filled electric lamps. Chapter 16: Chemistry in Everyday life Chemicals in medicines — analgesics, tranquilizers antiseptics, disinfectants, antimicrobials, antifertility drugs, antibiotics, antacids, antihistamines. The whole book is very illustrative and full of diagrams and data which can engage students to a better extent. Unit cell in two dimensional and three dimensional lattices, calculation of density of unit cell, packing in solids, packing efficiency, voids, number of atoms per unit cell in a cubic unit cell, point defects, electrical and magnetic properties. Vapor pressure of pure water at 298 K is 23.
Their general electronic configuration is ns2 np3. These questions are provided to test the students' understanding and learning over the topics that they have learned in the chapter. On moving down a group, the size of the central atom increases and the charge gets distributed over a large area decreasing the electron density. The depression in the freezing point of water observed is 1. It is for this reason that noble gases are very large in size as compared to other atoms belonging to the same period.
Now, the more ions produced, the greater is the depression of the freezing point. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene where the vapour pressure of pure benzene and naphthalene at 300 K are 50. Group 18 Elements: General introduction, electronic configuration, occurrence, trends in physical and chemical properties, uses. Solving the previous year questions and sample papers will help you get acquainted with the different types of questions and their marking scheme. Thus the n-1 d configuration of the metal and its ion plays important part in giving the observation set of properties to the metal or its ion.
These notes will certainly save your time during stressful exam days. Answer As we move down a group, the atomic size increases and the stability of the hydrides of group 15 elements decreases. This is because of increasing atomic sizes. Thanks for reading ncert solutions for class 12 chemistry. Group 17 Elements: General introduction, electronic configuration, oxidation states, occurrence, trends in physical and chemical properties; compounds of halogens, Preparation, properties and uses of Chlorine and Hydrochloric acid, interhalogen compounds, Oxoacids of halogens structures only. Extracts, vinegar and alcohol are prepared by fermentation and antibiotics like penicillin, streptomycin and ciprofloxacin have saved our lives from infectious diseases. Physics is considered to be a complex subject.
Cyanides and Isocyanides — will be mentioned at relevant places in text. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. This chapter holds approximately 5 marks in the board examination. After completing the chapter, for the preparation of session 2018 — 2019 exam, you are suggested to do the three tests of Level 1, Level 2 and Level 3 and discuss it with your classmates and school teacher for answers. It helps to build a strong foundation by making the concepts clearer and simpler to understand. This will surely help you to get the desired results.
View or download free pdf of ncert solutions for class 12 chemistry. Free cbse sample papers can easily enhance your marks in the board exam. It acts as a perfect self-help guidance for students without any doubt. Hardness of steel is depend upon the percent of carbon. Chapter 15: Polymers Classification — natural and synthetic, methods of polymerization addition and condensation , copolymerization, some important polymers: natural and synthetic like polythene, nylon polyesters, bakelite, rubber.
Haloarenes: Nature of C—X bond, substitution reactions Directive influence of halogen in monosubstituted compounds only. It consists all important concepts with proper explanations. Haloalkanes: Nomenclature, nature of C—X bond, physical and chemical properties, mechanism of substitution reactions, optical rotation. We have been protected against the diseases like cholera, malaria and T. This causes greater repulsion between the electron pairs around nitrogen, resulting in maximum bond angle. Therefore, mass of the solution containing 1.