Outside Delhi 2011) Give a few examples of amorphous solids. Ans: A unit cell is characterised by the following parameters: We are surrounded by different states of matter. This was an introduction to Chapter 1 of Chemistry Class 12. (C.B.S.E. Chemistry Class 12 NCERT Solutions: Chapter 1 The Solid State Part 2 Glide to success with Doorsteptutor material for CBSE : fully solved questions with step-by-step explanation - … The intermoleoilar forces present in case of water and ethyl alcohol are mainly due to the hydrogen bonding which is responsible for their high melting points. (ii) Face-centred and end-centred unit cells. Ans: In the ionic solids, the electrical conductivity is due to the movement of the ions. Class- XII-CBSE-Chemistry The Solid State . A compound is formed by two elements M and N. The element N forms ccp and atoms of the element M occupy 1/3 of the tetrahedral voids. Back of Chapter Questions . Hence, the formula of ferric oxide is Fe2O3. ∴ Formula of the compound is PQ. NCERT Solutions for Class 12 Chemistry Chapter 1 Solid State Exercises Questions and Intext Questions to view online or download in PDF format updated for new academic session 2020-2021 based on new NCERT Books. Here all questions are solved with detailed explanation and available for free to check. Ans: Glass is considered to be super cooled liquid because it shows some of the characteristics of liquids, though it is an amorphous solid. This calculated value of density is closely in agreement with its measured value of 8.92 g cm3. Chapter 1 The Solid State. 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 […] For example, it is slightly thicker at the bottom. Solution: The arrangement of the constituting particles has only short-range order, i.e., a regular and periodically repeating pattern is observed over short distances only, e.g., glass, rubber, and plastics. Hence, an electron deficient hole is created and therefore, it is a p – type semiconductor. Ans: It is a covalent or network solid. (a) Hexagonal close packing and cubic close packing (ii) p-type semiconductor: When a silicon or germanium is doped with group 13 element like B or Al, the dopant is present only with three valence electrons. NCERT Exemplar Problems and NCERT Exemplar Solutions of Class 12 Chemistry chapter 1, Solid State are available for download. Such substances remain permanently magnetised, once they have been magnetised. What are semi-conductors? Classify the following solids in different categories based on the nature of the intermolecular forces: sodium sulphate, copper, benzene, urea, ammonia, water, zinc sulphide, diamond, rubedium, argon, silicon. Sol. Hence, the ferromagnetic substance becomes a permanent magnet. Solution: (ii) Ionic solids are hard and brittle.Ionic solids are hard due to the presence of strong electrostatic forces of attraction. Ferrimagnetism arises due to the unequal number of magnetic moments in opposite direction resulting in some net magnetic moment. The property thus exhibited is called paramagnetism. Sol. 1.10 Calculate the efficiency of packing in case of a metal crystal for (i) simple cubic, (ii) body centred cubic, and (iii) face centred cubic (with the assumptions that atoms are touching each other). (i) The number of nearest neighbours of a particle are called its coordination number. NCERT Solutions for Class 12-science Chemistry CBSE, 1 The Solid State. All the solutions of The Solid State - Chemistry explained in detail by experts to help students prepare for their CBSE exams. Glass is a supercooled liquid and an amorphous substance. (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. 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 : Would it show cleavage property? 1.1. Class 12 NCERT Textbook Solutions cover all the exercises of each chapter. (a) in a cubic close-packed structure? What types of stoichiometric defects are shown by (C.B.S.E. NCERT Solutions for class 12 provided by our website will be helpful if you want to accelerate your performance in class 12. This ordering of domains persists even when external magnetic field is removed. Explain with the help of a suitable example. This will clear students doubts about any question and improve application skills while preparing for board exams. 1.20. (C.B.S.E. NCERT Books Class 12 Chemistry: The National Council of Educational Research and Training (NCERT) publishes Chemistry textbooks for Class 12. = 2 x 3.011 x 1023 = 6.022 x 1023 Along with NCERT sample questions, one must solve previous year questions and participate in mock tests to practise to perfection. Ans: NCERT solutions for Class 12 Chemistry Textbook chapter 1 (The Solid State) include all questions with solution and detail explanation. = 9.033 x 1023, 1.16. CBSE Guide of All Chapters given in the Book. Question 23. Solution: This is because when placed in magnetic field, their domains get oriented in the directions of magnetic field and a strong magnetic field is produced. The NCERT Solutions for Class 12 Chemistry Chapter 1 explain the structure, classification and properties of solids. Out of 98 Ni-atoms, suppose Ni present as Ni2+ = x The Chemistry NCERT Solutions Class 12 provides extensive step-by-step solutions to diffcult problmes and equations which prepare students to crack difficulty levels in easiest way. Solution: of voids = 3.011 x 1023 + 6.022 x 1023 Total charge on x Ni2+ and (98 – x) Ni3+ should Chemistry Class 12 Chapter 1 The Solid State The ratio less than 2 : 1 in Cu20 shows cuprous (Cu+) ions have been replaced by cupric (Cu2+) ions. Refractive index of a solid is observed to have the same value along all directions. Give the significance of a lattice point. Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 1 The Solid State: Section Name Topic Name 1 The Solid State 1.1 General Characteristics of Solid State 1.2 Amorphous and Crystalline Solids 1.3 Classification of Crystalline Solids 1.4 Crystal Lattices and Unit Cells 1.5 Number of Atoms in a Unit Cell 1.6 Close Packed […] Solid State NCERT Solution (part 1) Question – 1.1 - Define the term 'amorphous'. Solid-State Chemistry Class 12 NCERT Solutions: Question 3 and 4. Exercise Chapter 1 Class 12 Chemistry THE SOLID STATE Ncert Solutions Question 1:Define the term amorphous. Give a few examples of amorphous solids. Question 26. 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. 1.4 (i) What is meant by the term ‘coordination number’? (a) There is electrostatic force of attraction in both metallic and ionic crystals. 1.14. (i) In metals, conductivity strongly depends upon the number of valence electrons available in an atom. Important Questions for CBSE Class 12 Chemistry The Solid State PREVIOUS YEARS’ QUESTIONS 2015 Very Short Answer Type Questions [1 Mark] 1. 1.2. Sol. In this oxide, copper to oxygen ratio is slightly less than 2:1. Solid State NCERT Solution (part 1) Question – 1.1 - Define the term 'amorphous'. ∴ The formula of the compound = N3M2 or M2N3. (v) 13-15 group compounds : When the solid state materials are produced by combination of elements of groups 13 and 15, the compounds thus obtained are called 13-15 compounds. Question 17. Practice more on The Solid State. This type of magnetic moments are due to unpaired electrons in the same direction. CBSE & NCERT Chemistry Notes for Class 12 Solid State .Get Online & Offline Chapter wise video,sample paper with NCERT Solutions for class 12 Science chemistry. Electrical conductivity of semiconductors increases with increase in temperature, since more electrons can jump to the conduction band. Question 16. 1.7. Ans: In the two-dimensional square close-packed layer, a particular molecule is in contact with four molecules. These substances, however, lose their magnetism in the absence of the magnetic field. Each Sr2+ will replace two Na+ ions. For maintaining electrical neutrality, every two Cu+ ions will be replaced by one Cu2+ ion thereby creating a hole. (iii) Ferrimagnetic substances : Substances which are expected to possess large magnetism on the basis of the unpaired electrons but actually have small net magnetic moment are called ferrimagnetic substances, e.g., Fe3O4, ferrites of the formula M2+Fe2O4 where M = Mg, Cu, Zn, etc. 1.21. Ans: Let us take an example NaCl doped with SrCl, impurity when SrCl2 is added to NaCl solid as an impurity, two Na+ ions will be replaced and one of their sites will be occupied by Sr21- while the other will remain vacant. Give a few examples of amorphous solids. It is therefore, called space lattice or crystal lattice. hcp lattice has the highest packing efficiency. 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A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. It consists of 11 subtopics. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Ans: The lattice point denotes the position of a particular constituent in the crystal lattice. (ABABAB……. The NCERT Chemistry Books are based on the latest exam pattern and CBSE syllabus. NCERT Solutions for class 12 Chemistry. Ans: As the solid has same value of refractive index along all directions, it is isotropic in nature and hence amorphous. (i)corner and (ii)body centre of a cubic unit cell is part of its neighbouring unit cell. Conductors have no forbidden band. Metallic crystals are good conductors of electricity in solid state as electrons are free to move. ∴ Number of octahedral voids = 90 Describe the two main types of semiconductors and contrast their conduction mechanisms. Besides, our proficient experts of teaching have prepared these solutions. Moreover, the interparticle spaces are very few and small as well. They can conduct electricity only in die molten state or in aqueous solution. Delhi 2013) No. 5 mol of it? What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. CBSE NCERT Solution for Class 12 Chemistry Chapter 1: The Solid State – All Questions Answered Question 1.1: Define the term ‘amorphous’. Answer: The particles of solids are close packed and can only oscillate about their fixed positions. Since 1/3rd of the tetrahedral voids are occupied by the atoms of M, therefore, Such a substance shows some conductivity and it behaves as a semiconductor. ∴ Moles of cation vacancy in 100 moles NaCI = 10-3 1 ( the Solid State Solid is heated students who are preparing for board exam cation vacancies providing free... 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