(C.B.S.E. They are magnetised in the same direction as that of the applied field. (ii) Frenkel defect : This defect arises when some of the ions in the lattice occupy interstitial sites leaving lattice sites vacant. The solid state chemistry class 12 solutions in video mode . (a) There is electrostatic force of attraction in both metallic and ionic crystals. (c) Bonds are non-directional in both the cases. B is group 13 element and Si is group 14 element, there will be a free electron, So, it is an n-type semiconductor. NCERT Solutions for Class 12-science Chemistry CBSE, 1 The Solid State. Question 16. (ii) AgBr? Ans: When a solid is heated, vacancy defect is produced in the crystal. Comment. This calculated value of density is closely in agreement with its measured value of 8.92 g cm3. 1.11 Silver crystallises in fcc lattice. Book: National Council of Educational Research and Training (NCERT) (ii) Face-centred and end-centred unit cells. If edge length of the cell is 4.07 x 10-8 cm and density is 10.5 g cm-3, calculate the atomic mass of silver. Class 12 Chemistry NCERT Solutions Chapter 2 deals with Types of Solutions, Expressing Concentration of Solutions, Introduction to Solubility, Solubility of a Solid in a Liquid, Solubility of a Gas in a Liquid, Vapour Pressure of Liquid Solutions, Vapour Pressure of Liquid-Liquid Solutions, Raoult’s Law as a special case of Henry’s Law, Vapour Pressure of […] NCERT exercises and intex questions solution are given separately. 1.16. Sol. Moreover, the interparticle spaces are very few and small as well. (ii) Face-centred and end-centred unit cells. NCERT Solutions For Class 12 Chemistry Chapter 1 The Solid State September 29, 2019 by phani 45 Comments Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 1 The Solid State : NCERT Exemplar Solutions for class 12 Chemistry Solid State NCERT 12 Chemistry Exemplar Problem Text book Solutions. This was an introduction to Chapter 1 of Chemistry Class 12. NCERT Solutions For Class 12 Chemistry Chapter 1 The Solid State September 23, 2020 by phani Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 1 The Solid State : Co-ordination number of atoms P and Q = 8. Solid A is a very hard electrical insulator in. To which group should this impurity belong? (b) Both have high melting points. (iv) Antiferromagnetic substances : Substances which are expected to possess paramagnetism or ferromagnetism on the basis of unpaired electrons but actually they possess zero net magnetic moment are called antiferromagnetic substances, e.g., MnO. For example, it is slightly thicker at the bottom. Solution: On heating, some atoms or ions leave the lattice site completely, i.e., lattice sites become vacant. For example, InSb, AlP, GaAs, etc. It is a common defect in ionic compounds of high coordination number where both cations and anions are of the same size, e.g., KCl, NaCl, KBr, etc. (i) Face centred cubic (if) Face centred tetragonal (iii) Body centred cubic Answer: The particles of solids are close packed and can only oscillate about their fixed positions. Contribution by atoms Q present at the eight corners of the cube = \(\frac { 1 }{ 8 } \)= x 8 = 1 NCERT Solutions for Class 12 Chemistry Chapter 1 The Solid State PDF: Students who are in search of NCERT Solutions for Class 12 Chemistry Chapter 1 – The Solid State can refer to this article.All the NCERT Solutions of Solid State are solved by our academic experts at Embibe. Justify your answer. Refractive index of a solid is observed to have the same value along all directions. CBSE NCERT Solution for Class 12 Chemistry Chapter 1: The Solid State – All Questions Answered Question 1.1: Define the term ‘amorphous’. ∴ Moles of cation vacancy in 100 moles NaCI = 10-3 The interparticle forces are very strong. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Antiferromagnetism is due to the presence of equal number of magnetic moments in the opposite directions. A cubic solid is made of two elements P and Q. Chemistry Class 12 Chapter 1 The Solid State Most of the matter around us is in solid state. Amorphous solids are … Unit cell: Each bricks represents the unit cell while the block is similar to the space or crystal lattice. Upon melting, the ions present acquire some mobility. (c) Tetrahedral void: A tetrahedral void is formed when triangular void made by three spheres of a particular layer and touching each other. Thus, we can say that when a cation of higher valence is added as an impurity to an ionic solid, two or more cations of lower valency are replaced by a cation of higher valency to maintain electrical neutrality. Question: 1.2 - Why do solids have a definite volume? = 9.033 x 1023, 1.16. (b) in a body centred cubic structure? Delhi 2015) Question 24. These e-s absorb energy from visible light, get excited to higher energy level and when they fall back to ground state, they impart yellow colour to NaCl crystal. Analysis shows that nickel oxide has the formula Ni0.98 O1.00. ∴ Number of octahedral voids = 90 Ans: Ferromagnetic substances make better permanent magnets. 1.24. Give a few examples of amorphous solids. Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. What is the length of the side of the unit cell ? Along with NCERT sample questions, one must solve previous year questions and participate in mock tests to practise to perfection. Visit & Sign up https://einsteinclasses.com for Online Course & Online Test & Study Materials NCERT Solution, it's FREE but BEST. As conduction will be due to the presence of these positive holes, hence it is a p-type semiconductor. Moreover, the chapter is explained in an easy language. Outside Delhi 2011) (ii) Ionic solids are hard and brittle.Ionic solids are hard due to the presence of strong electrostatic forces of attraction. These ncert exemplar problem book chapter wise questions and answers are very helpful for CBSE board exam. No. Sol. These solutions for The Solid State are extremely popular among Class 12 Science students for Chemistry The Solid State Solutions come handy for quickly completing your homework and preparing for exams. Answer Amorphous solids are the solids whose constituent particles have a completely random arrangement. There are three states of matter. Glass is a supercooled liquid and an amorphous substance. (C.B.S.E. (i) Ferromagnetic substances : Substances which are attracted very strongly by a magnetic field are called ferromagnetic substances, e.g., Fe, Ni, Co and CrO2 show ferromagnetism. PDF download free. For maintaining electrical neutrality, every two Cu+ ions will be replaced by one Cu2+ ion thereby creating a hole. Question 19. Hence, it belongs fully to unit cell. Chemistry Class 12 NCERT Solutions Chapters. Ans: Packing efficiency of: If the gap between valence band and next higher unoccupied conduction band is large, electrons cannot jump into it and such a substance behaves as insulator. Extramarks offers NCERT solutions for chapter Solid State of CBSE Class 12. Thus Si or Ge doped with B or Al is called p-type semiconductor, p stands for positive hole, since it is the positive hole that is responsible for conduction. Ans:  (i) In a hexagonal unit cell : Foreign 2015), 1.18. This will clear students doubts about any question and improve application skills while preparing for board exams. Solids have definite volume, shape, and mass due to the short distance between the fixed position of particles. Solid-State Chemistry Class 12 NCERT Solutions: Question 3 and 4. (i) In metals, conductivity strongly depends upon the number of valence electrons available in an atom. The best app for CBSE students now provides Solid State class 12 Notes Chemistry latest chapter wise notes for quick preparation of CBSE board exams and school-based annual examinations. What is the formula of the compound? NCERT 12 Chemistry Solutions for Class 12 Chapter 1 The Solid State includes all the important topics with detailed explanation that aims to help students to understand the concepts better. You determine the atomic mass 93u sixteen chapters which contain diagrams, illustrations, theoretical questions and participate mock! 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