type). Hence, x × 2 + (98 – x) × 3 = 100 × 2 or 2x + 294 – 3x = 200 or x = 94 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. 1.10. 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. Ans: In the ionic solids, the electrical conductivity is due to the movement of the ions. Why do solids have definite volume? (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. Contribution by atom P present at the body centre = 1 To learn more access Solid State Chemistry Class 12 Notes PDF on BYJU’S. 1.1. Ans: It is a covalent or network solid. Chapter 3 – Electrochemistry. Name the parameters that characterise a unit cell. Solution: The particles of solids are close to each other, and they are tightly bonded, having 1.12. 1.2. Visit & Sign up https://einsteinclasses.com for Online Course & Online Test & Study Materials NCERT Solution, it's FREE but BEST. Class 12 Chemistry Notes Chapter 1 The Solid State. NCERT Exemplar Solutions for class 12 Chemistry Solid State NCERT 12 Chemistry Exemplar Problem Text book Solutions. Each Sr2+ will replace two Na+ ions. What fractions of nickel exist as Ni2+ and Ni3+ ions? NCERT solutions for Class 12 Chemistry Textbook chapter 1 (The Solid State) include all questions with solution and detail explanation. Download NCERT Solutions for class 12 Chemistry all chapters given in separate PDF. Moreover, the chapter is explained in an easy language. 2. Ans: Packing efficiency of: Sol. Ask your doubts through DISCUSSION FORUM of Tiwari Academy. Being amorphous solid, it will not show a clean cleavage and when cut, it will break into pieces with irregular surfaces. Here all questions are solved with detailed explanation and available for free to check. Analysis shows that nickel oxide has the formula Ni0.98 O1.00. be equal to charge on 100 O2- ions. 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. Sol. Point Defects – The defects caused by missing or misplaced atoms or ions in the crystal. Out of 98 Ni-atoms, suppose Ni present as Ni2+ = x The NCERT Chemistry Books are based on the latest exam pattern and CBSE syllabus. Aakash NCERT Solutions for Class 12 Chapter 1 The solid-state are solved by subject experts at Aakash as per the CBSE textbook guidelines. (b) Crystal lattice and unit cell To learn more access Solid State Chemistry Class 12 Notes PDF on BYJU’S. 1.23. How can you determine the atomic mass of an unknown metal if you know its density and dimensions of its unit cell ? Ans: When a solid is heated, vacancy defect is produced in the crystal. Answer Amorphous solids are the solids whose constituent particles are of irregular shapes and have short range order. NCERT exercises and intex questions solution are given separately. Total no. 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. The solid state chemistry class 12 solutions in video mode . Download Class 12 Chemistry NCERT solutions in chapter-wise PDF format for board exam 2020 . They can conduct electricity only in die molten state or in aqueous solution. NCERT Solutions for Class 12 Chemistry, Chapter 1 - The Solid State In the previous classes, we have learnt about the states of matter available in nature. 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. of atoms in packing =3.011 x 1023 Question 17. 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 : Sol. Water = 273 K, Ethyl alcohol = 155.7 K, Diethylether = 156.8 K, Methane = 90.5 K. A sphere is fitted into the octahedral void as shown in the diagram. Here, this hole moves throughout the crystal like a positive charge giving rise to electrical conductivity. Book: National Council of Educational Research and Training (NCERT) ∴ Moles of cation vacancy in 100 moles NaCI = 10-3 1.20. NCERT Solutions for class 12 provided by our website will be helpful if you want to accelerate your performance in class 12. Ans: (i) An atom at the comer is shared by eight adjacent unit cells. (c) Tetrahedral void: A tetrahedral void is formed when triangular void made by three spheres of a particular layer and touching each other. (i) ZnS crystals may show Frenkel defects since the cationic size is smaller as compared to anionic size. 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. Packing efficiency: It is the percentage of total space filled by the particles. NCERT 12th class Chemistry exemplar book solutions for chapter 1 Solid State are available in PDF format for free download. In this NCERT Solutions for Class 12 Chemistry Chapter 1, we have discussed this chapter. (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. (ii) Ionic solids are hard and brittle. If density is 8.55 g cm-3, calculate atomic radius of niobium, using its atomic mass 93u. Sol. class 12 chemistry ncert solutions – Chemistry Part I. Sol. Hello, friends, this video contains a detailed explanation of Solid state intended for upcoming board exams. Edge length (a) = $$2\sqrt { 2 } r$$ = 2 x 1.4142 x 0.144 mm = 0.407 nm, Question 22. Question: 1.2 - Why do solids have a definite volume? Give a few examples of amorphous solids. 12 Chemistry Solutions – All Chapters Chapter 1: The Solid State. (c) Tetrahedral void and octahedral void. Similarities: (ii) (a) 12 (b) 8. Justify your answer. 1.1. “The Solid State” is an important chapter in Chemistry from the examination perspective. In the glass, SiO4 tetrahedra are joined in a random manner. It is therefore, called space lattice or crystal lattice. Contribution by atoms Q present at the eight corners of the cube = $$\frac { 1 }{ 8 }$$= x 8 = 1 Students who are preparing for their Class 12 exams must go through Class 12 Chemistry NCERT Solutions Chapter 1 The Solid State. 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 carbide. hcp lattice has the highest packing efficiency. (i) In a hexagonal unit cell : Most of the matter around us is in solid state. 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. Answer Amorphous solids are the solids whose constituent particles have a completely random arrangement. Sol. 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. Why is glass considered as super cooled liquid ? Exercise well for Chemistry class 12 chapter 2 The Solid State with explanatory concept video solutions. ∴ Number of octahedral voids = 90 Solution: Class 12 NCERT Solutions for The Solid State. The two main types of semiconductors are n-type and p-type. CBSE Guide of All Chapters given in the Book. Answer: The particles of solids are close packed and can only oscillate about their fixed positions. Amorphous solids are isotropic in nature and melt over a range of temperature. What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. Let moles of NaCI = 100 Gold (atomic radius = 0.144 nm) crystallises in a face centred unit cell. Question: 1.2 - Why do solids have a definite volume? Ans: Solids keep their volume because of rigidity in their structure. Answer: Solids having constituent particles with irregular shapes and short range order are called amorphous solids. 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. (i)corner and (ii)body centre of a cubic unit cell is part of its neighbouring unit cell. 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. Chemistry- the branch of science associated with the substances with which matter is composed- has helped us understand the three states easily found, i.e. PDF Download Free. a = b # c; α = β = 90° and γ = 120° the no. Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it. This was an introduction to Chapter 1 of Chemistry Class 12. Amorphous solids do not have a sharp melting point and melt over a range of temperature. Download NCERT Solutions for class 12 Chemistry all chapters given in separate PDF. Students will also learn the meaning of coordination number in both cubic close-packed structure and body centred cubic structure. This chapter also talks about crystalline and amorphous solids, as well as imperfections in solids. Sol. As a result-of this defect, density of the substances decreases. The ferromagnetic material, CrO2, is used to make magnetic tapes used for audio recording. Get NCERT Solutions for class 12 Chemistry, chapter 2 The Solid State in video format & text solutions. Here all questions are solved with detailed explanation and available for free to check. 1.7. This property is shown by those substances whose atoms, ions or molecules contain unpaired electrons, e.g., O2, Cu2+, Fe3+, etc. Solids have definite volume, shape, and mass due to the short distance between the fixed position of particles. Due to this defect density does not change, electrical conductivity increases to a small extent and there is no change in overall chemical composition of the crystal. Question 20. The e-1 s lost by Na to form Na+ (Na+ + Cl–—> NaCl) then diffuse into the crystal to occupy the anion vacancies. 1.17. Hence, the ferromagnetic substance becomes a permanent magnet. Such a substance shows some conductivity and it behaves as a semiconductor. For example, it is slightly thicker at the bottom. Let’s Take a Look. (i) Metallic and ionic crystals (i) Tetra phosphorus decoxide (P4O10) (ii) Ammonium phosphate, (NH4)3PO4 (iii) SiC (iv) I2 (v) P4 (vii) Graphite (viii), Brass (ix) Rb (x) LiBr (xi) Si Classify each of the following as being either a p-type or n-type semiconductor : Question 21. Explain your answer. Ans: Metallic solids. 1.4 (i) What is meant by the term ‘coordination number’? What is the formula of the compound ? ∴ Ratio of Fe3+ : O2- = 60 : 90 = 2 : 3 Since 1/3rd of the tetrahedral voids are occupied by the atoms of M, therefore, 1.16. NCERT Solutions for Class 12 Chemistry Book are given below. NCERT Solutions for Class 12 Chemistry - Chapter-Wise . of atoms in close packings 0.5 mol =0.5 x 6.022 x 1023 =3.011 x 1023 1.19. CBSE NCERT Solution for Class 12 Chemistry Chapter 1: The Solid State – All Questions Answered Question 1.1: Define the term ‘amorphous’. (C.B.S.E Foreign 2015). 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