NCERT Solutions for Class 12 Chemistry Chapter 1- Solid State and Fields. Quartz is the crystalline form of silica (SiO2) in which tetrahedral units SiO4 are linked with each other in such a way that the oxygen atom of one tetrahedron is shared with another Si atom. Each Sr2+ will replace two Na+ ions. Ans: A unit cell is characterised by the following parameters: Due to this defect the density of the substance increases. (ii) In a face-centered unit cell, constituent particles are located at all the corners as well as at the centres of all the faces. Chapter 1 The Solid State. Question 18. 1.14 If the radius of the octahedral void is r and radius of the atoms in close-packing is R, derive relation between rand R. Extramarks offers NCERT solutions for chapter Solid State of CBSE Class 12. Explain with the help of a suitable example. No. Hello, friends, this video contains a detailed explanation of Solid state intended for upcoming board exams. Amorphous solids do not have a sharp melting point and melt over a range of temperature. NCERT Solutions for Class 12 Chemistry Chapter 1- Solid State and Fields. 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. 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. 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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. Comment on the nature of this solid. NCERT solutions for class 12 Chemistry solved by LearnCBSE.in expert teachers from latest edition books and as per NCERT (CBSE) guidelines. Question: 1.2 - Why do solids have a definite volume? As a result-of this defect, density of the substances decreases. As a result, their volumes cannot change by applying pressure. Solid State NCERT Solution (part 1) Question – 1.1 - Define the term 'amorphous'. In this NCERT Solutions for Class 12 Chemistry Chapter 1, we have discussed this chapter. Why is glass considered as super cooled liquid ? Out of 98 Ni-atoms, suppose Ni present as Ni2+ = x 1.1. Which physical property is affected by it and in what way? 1.3 Classify each of the following solids as ionic, metallic, modular, network (covalent), or amorphous: Chapter 1 of Class 12 Chemistry NCERT book deals with topics related to the solid-state. type). NCERT Books & Solutions, Assignments, Sample Papers, Notes and books for revision are available to download. a = b # c; α = β = 90° and γ = 120° 1.21. PDF Download Free. 1.24. Ans: In the two-dimensional square close-packed layer, a particular molecule is in contact with four molecules. Sol. Question 16. Water = 273 K, Ethyl alcohol = 155.7 K, Diethylether = 156.8 K, Methane = 90.5 K. Solid-State Chemistry Class 12 NCERT Solutions: Question 3 and 4. It consists of 11 subtopics. Ans: Thus silicon or germanium doped with P or As is called H-type semiconductor, a-indicative of negative since it is the electron that conducts electricity. Outside Delhi 2011) These ncert exemplar problem book chapter wise questions and answers are very helpful for CBSE board exam. Give a few examples of amorphous solids. Get NCERT Solutions for class 12 Chemistry, chapter 2 The Solid State in video format & text solutions. of atoms in packing =3.011 x 1023 NCERT Books & Solutions, Assignments, Sample Papers, Notes and books for revision are available to download. Ans. Let moles of NaCI = 100 of tetrahedral voids occupied = 2x/3 Higher the melting point, greater are the forces holding the constituent particles together and thus greater is the stability of a crystal. Class 12 NCERT Solutions for The Solid State. 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 - … = 2 x 3.011 x 1023 = 6.022 x 1023 If its density is 2:7 x 103 kg m-3, what is the nature of the cubic unit cell ? Sol. 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. These sites are called F-centres. Sol. (i) ZnS hcp lattice has the highest packing efficiency. Ans: The constituent particles in solids have fixed positions and can oscillate about their mean positions. Why are ionic solids conducting in the molten state and not in the solid-state? Delhi 2013) Total no. Name the parameters that characterise a unit cell. Aluminium crystallises in a cubic close packed structure. The property thus exhibited is called paramagnetism. Simple cubic = 52.4% bcc = 68% hcp = 74% Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. All the solutions of The Solid State - Chemistry explained in detail by experts to help students prepare for their CBSE exams. To maintain electrical neutrality it occupies one position and thus creates one cation vacancy. Chapter 12: Aldehydes Ketones And Carboxylic Acids Chapter 13: Amines Chapter 14: Biomolecules Chapter 15: Polymers Chapter 16: Chemistry In Everyday Life NCERT Solutions for Class 12 Chemistry. Solid State NCERT InText Solution. 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. When NaCl crystal is heated in presence of Na vapour, some Cl–ions leave their lattice sites to combine with Na to form NaCl. PDF download free. (a) in a cubic close-packed structure? Give the significance of a lattice point. Ans: When a solid is heated, vacancy defect is produced in the crystal. Exercise well for Chemistry class 12 chapter 2 The Solid State with explanatory concept video solutions. Quartz can be converted into glass by melting it and cooling the melt very rapidly. Solution: 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 : If NaCI is doped with 10-3 mol % SrCl2, what is the concentration of cation vacancies? This chemistry class 12 solution comprises sixteen chapters which contain diagrams, illustrations, theoretical questions and questions related to chemical equations. SaralStudy providing Find Free online CBSE NCERT Soutions for chapter 1 The Solid State of Class 12 Chemistry detail solutions from SaralStudy. NCERT solutions for class 12 chemistry chapter 1 The Solid State - As we know that there are three states of matter which are solid, liquid, and gas but in the NCERT solutions for class 12 chemistry chapter 1, you will only get to know the solutions to Solid State. Answer Amorphous solids are the solids whose constituent particles have a completely random arrangement. What is the co-ordination number of P and Q? In a monoclinic unit cell : Analysis shows that nickel oxide has the formula Ni0.98 O1.00. Answer Amorphous solids are the solids whose constituent particles have a completely random arrangement. How can you determine the atomic mass of an unknown metal if you know its density and dimensions of its unit cell ? (ii) If the gap between the valence band and conduction band is small, some electrons may jump from valence band to the conduction band. This ordering of domains persists even when external magnetic field is removed. The NCERT Chemistry Books are based on the latest exam pattern and CBSE syllabus. 1.9 Explain: 1.18. Upon melting, the ions present acquire some mobility. Students will also learn the meaning of coordination number in both cubic close-packed structure and body centred cubic structure. Why are solids rigid? Give a few examples of amorphous solids. Would it show cleavage property? They are – solid, liquid and gas. Ans: The lattice point denotes the position of a particular constituent in the crystal lattice. Ans: NaCI = 10-3 × 10-2 = 10-5 Answer: Solids having constituent particles with irregular shapes and short range order are called amorphous solids. The ratio less than 2 : 1 in Cu20 shows cuprous (Cu+) ions have been replaced by cupric (Cu2+) ions. We have provided The Solid State Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. Suppose the number of oxide ions (O2-) in the packing = 90 F-centres impart colour to crystals. (i) Schottky defect : In Schottky defect a pair of vacancies or holes exist in the crystal lattice due to the absence of equal number of cations and anions from their lattice points. B is group 13 element and Si is group 14 element, there will be a free electron, So, it is an n-type semiconductor. End-Centred unit cells, calculate the atomic mass of an unknown metal if you to. 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