The number of effective particles per unit cell is $=8\times\frac=0.44$ Let each side of a cube is ‘a’ and radius of each particle is ‘r’ then a = 2r Calculate the packing efficiency of a metal crystal for a simple cubic lattice.Īns. (i) Tetrahedral = 2N, (ii) Octahedral=N.ġ1. (i) tetrahedral, and (ii) octahedral sites are present?Īns. ![]() In a close packing of N spheres, how many ![]() Metal excess non-stoichiometric point defects.ġ0. Name the non-stoichiometric point defect responsible for colour in alkali metal halides.Īns. What is the relationship between the edge length (a) of the unit cell and radius (r) of an atom in a face centred unit cell?ĩ. Metallic substances conduct electricity through electrons while ionic substances conduct electricity in molten state or in solution through ions.Ĩ. How do metallic and ionic substances differ in conducting electricity?Īns. Density of solid decreases as there is loss of matter.ħ. What is the effect of Schottky defect on the density of solid?Īns. are different in different directions of crystalline solids which is called anisotropy.Ħ. Many physical properties like refractive index, electrical resistance etc. Crystalline solids are anisotropic in nature. Constituents forming ionic solids are three-dimensional arrangement of cations and anions while kernels and mobile sea of electrons form metallic solids.ĥ. Write a feature which distinguishes a metallic solid from an ionic solid.Īns. What is the coordination number of an atom in hcp?Ĥ. These F-centres are responsible for pink colour.ģ. Cl - ions diffuse to surface and form LiCl with oxidized vapours of Li and an electron is released which diffuses into the crystal and occupies vacant anionic site which is called F-centres or colour centre. LiCl acquires pink colour when heated in Li vapours. Van der Waals forces hold camphor molecules together and this is a molecular solid.Ģ. What type of forces hold molecules of camphor together and what solid is it?Īns. These notes are extremely useful and reliable as they are prepared after analysing previous years Class 12 Chemistry papers to include all the crucial questions and topics in easy language at one place.ĭownload CBSE Class 12 Chemistry Notes 2023-24 PDFĪlso, check CBSE Class 12 Chemistry revision notes for other chapters:ĬBSE Class 12 Chemistry Chapter-wise NotesĬhapter 6 - General Principles and Processes of Isolation of ElementsĬhapter 11 - Alcohols, Phenols and EthersĬhapter 12 - Aldehydes, Ketones and Carboxylic Acidsġ. Written in crisp and easy to understand language, Solid-state Chemistry Class 12 notes consist of short notes and important questions that have high chances to come in the board exam. For that, they can take help from Class 12th Chemistry Chapter 1 notes, prepared by the expert Chemistry teachers who have sound knowledge of the latest CBSE syllabus and Class 12 board exam pattern. ![]() To perform well in the Class 12 Chemistry board exam, students must understand Chapter 1 thoroughly. The state of matter forms the fundamentals for many chapters later on. Class 12 Chapter 1 The Solid State is an essential chapter that helps you to understand the basics of Chemistry as it focuses on the State of Matter.
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