(iii) Interstitial defect : When some constituent particles (atoms or molecules) occupy an interstitial site of the crystal, it is said to have interstitial defect. Under what conditions could quartz be converted into glass? 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. 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 : Most of the matter around us is in solid state. Sol. It consists of 11 subtopics. Solution: (C.B.S.E Foreign 2015). NCERT 12th class Chemistry exemplar book solutions for chapter 1 Solid State are available in PDF format for free download. Due to this defect density of crystal decreases and it begins to conduct electricity to a smaller extent. Ans: (i) An atom at the comer is shared by eight adjacent unit cells. All the solutions of The Solid State - Chemistry explained in detail by experts to help students prepare for … (a) in a cubic close-packed structure? Study notes & practice Solid State sample question papers to score high in school board exams. Here all questions are solved with detailed explanation and available for free to check. of octahedral voids = No. Explain the following terms with suitable examples : Solution: Explain the following with suitable example: Solution: These ncert exemplar problem book chapter wise questions and answers are very helpful for CBSE board exam. 1.20. NCERT Books Class 12 Chemistry: The National Council of Educational Research and Training (NCERT) publishes Chemistry textbooks for Class 12. Here all questions are solved with detailed explanation and available for free to check. Besides, our proficient experts of teaching have prepared these solutions. structure. Solids have definite volume, shape, and mass due to the short distance between the fixed position of particles. 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. Back of Chapter Questions . Get NCERT Solutions for class 12 Chemistry, chapter 2 The Solid State in video format & text solutions. Ans: In the two-dimensional square close-packed layer, a particular molecule is in contact with four molecules. Question 16. Ferrimagnetism arises due to the unequal number of magnetic moments in opposite direction resulting in some net magnetic moment. This type of magnetic moments are due to unpaired electrons in the same direction. (ii) Paramagnetic substances : Substances which are weakly attracted by the external magnetic field are called paramagnetic substances. Why are ionic solids conducting in the molten state and not in the solid-state? (c) Bonds are non-directional in both the cases. 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. Ans:  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). Therefore, the ionic solids become conducting, 1.9. CBSE NCERT Solution for Class 12 Chemistry Chapter 1: The Solid State – All Questions Answered Question 1.1: Define the term ‘amorphous’. of atoms of N present in ccp = x Question: 1.2 - Why do solids have a definite volume? To which group should this impurity belong? Most of the matter around us is in solid state. Download NCERT Solutions for class 12 Chemistry all chapters given in separate PDF. 1.17. Ans: Ferromagnetic substances make better permanent magnets. How can you determine the atomic mass of an unknown metal if you know its density and dimensions of its unit cell ? NCERT solutions for class 12 Chemistry solved by LearnCBSE.in expert teachers from latest edition books and as per NCERT (CBSE) guidelines. Hydrogen bonding is stronger in case of water than ethyl alcohol and hence water has higher melting point then ethyl alcohol. Packing efficiency: It is the percentage of total space filled by the particles. An element with molar mass 2:7 x 10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. 1.21. Why are solids rigid? Sol. 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. ∴ Number of octahedral voids = 90 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. 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. Through these two answers, students will be able to classify solid as ionic, metallic, molecular, covalent or amorphous. (ii) Face-centred and end-centred unit cells. (b) in a body centred cubic structure? Hello, friends, this video contains a detailed explanation of Solid state intended for upcoming board exams. NaCI = 10-3 × 10-2 = 10-5 Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Ans: Solids keep their volume because of rigidity in their structure. Solid states deal with arrangements of particles in solids that result in several types of structure in solids. What type of solids are electrical conductors, malleable and ductile? NCERT Solutions for Class 12 Chemistry Chapter 1- Solid State and Fields. There are three states of matter. Describe the two main types of semiconductors and contrast their conduction mechanisms. Moreover, the chapter is explained in an easy language. 1.19. NCERT Exemplar Problems and NCERT Exemplar Solutions of Class 12 Chemistry chapter 1, Solid State are available for download. = 2 x 3.011 x 1023 = 6.022 x 1023 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 a compound in which the element Y forms ccp lattice and atoms of X occupy l/3rd of tetrahedral voids? (c) Tetrahedral void: A tetrahedral void is formed when triangular void made by three spheres of a particular layer and touching each other. 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. The property thus exhibited is called paramagnetism. What is the formula of the compound? Download NCERT Solutions for class 12 Chemistry all chapters given in separate PDF. In terms of band theory, what is the difference. A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. NCERT Solutions for Class 12 Chemistry in PDF file format to free download based on latest NCERT Books, Solutions for Class 12 (+2 PUC) Chemistry updated for new academic session 2020-2021 are given below to use free. This will clear students doubts about any question and improve application skills while preparing for board exams. This property is shown by those substances whose atoms, ions or molecules contain unpaired electrons, e.g., O2, Cu2+, Fe3+, etc. 5 mol of it? the no. This ordering of domains persists even when external magnetic field is removed. Amorphous solids do not have a sharp melting point and melt over a range of temperature. Delhi 2015) This can be possible only if it has flown like liquid, though very slowly. Solids have definite volume, shape, and mass due to the short distance between the fixed position of particles. An element with molar mass 2:7 x 10, NCERT Solutions For Class 12 Chemistry The Solid State, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10, Calculations Involving Unit Cell Dimensions. Get here NCERT Solutions for Class 12 Chemistry Chapter 1.These NCERT Solutions for Class 12 of Chemistry subject includes detailed answers of all the questions in Chapter 1 – The Solid State provided in NCERT Book which is prescribed for class 12 in schools. NCERT solutions for Class 12 Chemistry Textbook chapter 1 (The Solid State) include all questions with solution and detail explanation. Point Defects – The defects caused by missing or misplaced atoms or ions in the crystal. 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. 1.4 (i) What is meant by the term ‘coordination number’? 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. 1.15. Distinguish between : How will you distinguish between the following pairs of terms : We always try to provide best ncert solutions for class 12 subject Chemistry chapter Chapter 1: THE SOLID STATE. What is the total number of voids in 0. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (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. (C.B.S.E. 12 Chemistry Solutions – All Chapters Chapter 1: The Solid State. Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 1 The Solid State: 1.1. Higher the melting point, greater are the forces holding the constituent particles together and thus greater is the stability of a crystal. Exercise Chapter 1 Class 12 Chemistry THE SOLID STATE Ncert Solutions Question 1:Define the term amorphous. What is the formula of the compound? solid as well as in molten state and melts at extremely high temperature. What is the formula of a compound […] type). Exercise Chapter 1 Class 12 Chemistry THE SOLID STATE Ncert Solutions Question 1:Define the term amorphous. For example, it is slightly thicker at the bottom. Sorry!, This page is not available for now to bookmark. 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 […] CBSE Guide of All Chapters given in the Book. 1.7. Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, Teflon, potassium nitrate, cellophane, polyvinyl chloride, fibreglass, copper Question: 1.1 - Why are solids rigid? Students will also learn the meaning of coordination number in both cubic close-packed structure and body centred cubic structure. NCERT Solutions for class 12 provided by our website will be helpful if you want to accelerate your performance in class 12. 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. 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. Sol. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. The NCERT Chemistry Books are based on the latest exam pattern and CBSE syllabus. This defect is generally found in ionic crystals where anion is much larger in size than the cation, e.g., AgBr, ZnS, etc. A compound forms hexagonal close-packed. Melting points of given substances are following. ∴ Moles of cation vacancy in 100 moles NaCI = 10-3 Class- XII-CBSE-Chemistry The Solid State . Differences: NCERT exercises and intex questions solution are given separately. Solid-State Chemistry Class 12 NCERT Solutions: Question 3 and 4. of atoms in packing =3.011 x 1023 “The Solid State” is an important chapter in Chemistry from the examination perspective. (i) Hexagonal and monoclinic unit cells 1.8 How many lattice points are there is one unit cell of each of the following lattices? Solid State NCERT InText Solution. Question 17. 98 Ni-atoms are associated with 100 O – atoms. = 10-5 × 6.022 × 1023 = 6.022 × 1018 mol-1. (a) There is electrostatic force of attraction in both metallic and ionic crystals. What is the two-dimensional coordination number of a molecule in a square close-packed layer? Refractive index of a solid is observed to have the same value along all directions. (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. Upon melting, the ions present acquire some mobility. The ratio less than 2 : 1 in Cu20 shows cuprous (Cu+) ions have been replaced by cupric (Cu2+) ions. NCERT Solutions for Class 12 Chemistry in PDF file format to free download based on latest NCERT Books, Solutions for Class 12 (+2 PUC) Chemistry updated for new academic session 2020-2021 are given below to use free. It is therefore, called space lattice or crystal lattice. Ans: Packing efficiency of: Ans: The lattice point denotes the position of a particular constituent in the crystal lattice. Revise concepts such as column chromatography, zone refining, … Amorphous solids are … 1.15 Copper crystallises into a fee lattice with edge length 3.61 x 10-8 cm. Conductors have no forbidden band. Why is glass considered as super cooled liquid ? (ii) AgBr? Besides, our proficient experts of teaching have prepared these solutions. Sol. What are semi-conductors? Book: National Council of Educational Research and Training (NCERT) Question 24. (b) Crystal lattice and unit cell 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. 1.12. 1.9 Explain: No. Hence, the formula of ferric oxide is Fe2O3. Chemistry Class 12 NCERT Solution chapter tries to clarify the concepts on general characteristics of Solid-State, the difference between amorphous crystalline solids, helps students to learn about the nature of binding forces in matter. Sol. Practice more on The Solid State. PDF Download Free. NCERT exercises and intex questions solution are given separately. 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 - … Give a few examples of amorphous solids. What fractions of nickel exist as Ni2+ and Ni3+ ions? Ans: Crystalline solids: Benzoic acid, potassium nitrate, copper Amorphous solids: Polyurethane, Teflon, cellophane, polyvinyl chloride, fibreglass. 1.11. Answer: Solids having constituent particles with irregular shapes and short range order are called amorphous solids. The NCERT Solutions for Class 12 Chemistry Chapter 1 explain the structure, classification and properties of solids. NCERT Solutions for Class 12 Chemistry Book are given below. Sol. A cubic solid is made of two elements P and Q. 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. NCERT solutions for Class 12 Chemistry Textbook chapter 1 (The Solid State) include all questions with solution and detail explanation. NCERT Chapter 6 solutions for CBSE Class 12 Chemistry covers topics like oxidation reduction, uses of zinc, magnetic separation method for concentration of ores, hydrometallurgy of copper, etc. 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 […] Such a substance shows some conductivity and it behaves as a semiconductor. 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. What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. This was an introduction to Chapter 1 of Chemistry Class 12. 1.3. How many of these are tetrahedral voids? Chemistry Class 12 Chapter 1 The Solid State 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. Foreign 2015), 1.18. Solution: NCERT Solutions for Class 12 Chemistry Chapter 1 – The Solid State. Ans: In the ionic solids, the electrical conductivity is due to the movement of the ions. Hence, they are rigid. Unit cell: Each bricks represents the unit cell while the block is similar to the space or crystal lattice. 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. Moreover, the interparticle spaces are very few and small as well. Ans: Let us take an example of NaCl. 1.24. Metallic bond may be strong or weak depending upon the number of valence electrons and the size of the kernels. Contribution by atoms Q present at the eight corners of the cube = \(\frac { 1 }{ 8 } \)= x 8 = 1 Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it. 1.16. 1.8. www.embibe.com . What type of solid is it? Dipole-dipole interactions are present in case of diethylether. This will clear students doubts about any question and improve application skills while preparing for board exams. 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. Foreign 2015) (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 Can you account for the fact that this substance is a p-type semiconductor? Let’s Take a Look. NCERT Solutions for Class 12 Science Chemistry Chapter 1 The Solid State are provided here with simple step-by-step explanations. Sol. Ans: was last updated on 19th January 2021 The two Ans: Comment. No. Why is glass considered as super cooled liquid ? The NCERT Solutions for Class 12 Chemistry Chapter 1 explain the structure, classification and properties of solids. Gold (atomic radius = 0.144 nm) crystallises in a face centred unit cell. Aakash NCERT Solutions for Class 12 Chapter 1 The solid-state are solved by subject experts at Aakash as per the CBSE textbook guidelines. NCERT Solutions for Class 12 Science Chemistry Chapter 1 The Solid State are provided here with simple step-by-step explanations. Ans: Glass is considered to be super cooled liquid because it shows some of the characteristics of liquids, though it is an amorphous solid. “The Solid State” is an important chapter in Chemistry from the examination perspective. NCERT Solutions for Class 12-science Chemistry CBSE, 1 The Solid State. the no. If this band is partially filled or it overlaps with the higher energy unoccupied conduction band, then electrons can flow easily under an applied electric field and the metal behaves as a conductor. NCERT Solutions for Class 12 Chemistry Chapter 1 – The Solid State. Chemistry Class 12 NCERT Solutions Chapters. Aakash NCERT Solutions for Class 12 Chapter 1 The solid-state are solved by subject experts at Aakash as per the CBSE textbook guidelines. Ans: Let us suppose that, Ans: When a solid is heated, vacancy defect is produced in the crystal. (i) The number of nearest neighbours of a particle are called its coordination number. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 1 The Solid State with Answers Pdf free download. Electrical conductivity of semiconductors increases with increase in temperature, since more electrons can jump to the conduction band. We always try to provide best ncert solutions for class 12 subject Chemistry chapter Chapter 1: THE SOLID STATE. What is the length of the side of the unit cell ? Such substances remain permanently magnetised, once they have been magnetised. Amorphous solids are those substances, in which there is no regular arrangement of its constituent particles, (i.e., ions, atoms or molecules). Chapter 1 The Solid State. On heating, some atoms or ions leave the lattice site completely, i.e., lattice sites become vacant. 1.22. Sol. Thus, a unit cell is the fundamental building block of the space lattice. NCERT Books & Solutions, Assignments, Sample Papers, Notes and books for revision are available to download. ∴ The formula of the compound = N3M2 or M2N3. (a) In hexagonal close packing (hcp), the spheres of the third layer are vertically above the spheres of the first layer 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. This calculated value of density is closely in agreement with its measured value of 8.92 g cm3. Exercise well for Chemistry class 12 chapter 2 The Solid State with explanatory concept video solutions. These solids are isotropic in nature and melt […] (i) Face centred cubic (if) Face centred tetragonal (iii) Body centred cubic For example, InSb, AlP, GaAs, etc. PDF download free. (i) The basis of similarities and differences between metallic and ionic crystals. Ge is group 14 element and In is group 13 element. 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. They are – solid, liquid and gas. To learn more access Solid State Chemistry Class 12 Notes PDF on BYJU’S. NCERT Solutions for Class 12 Chemistry - Chapter-Wise . Explain with the help of a suitable example. Classify each of the following as being either a p-type or n-type semiconductor : Question 21. If NaCI is doped with 10-3 mol % SrCl2, what is the concentration of cation vacancies? NCERT Books & Solutions, Assignments, Sample Papers, Notes and books for revision are available to download. (b) Both have high melting points. Show that the calculated density is in agreement with its measured value of 8.92 gcm-3. F-centres impart colour to crystals. ∴ Moles of SrCl2 doped = 10-3 NCERT Solutions for class 12 Chemistry. Students who are preparing for their Class 12 exams must go through Class 12 Chemistry NCERT Solutions Chapter 1 The Solid State. main types of semiconductors are n-type and p-type. 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. On the other hand, in cubic close packing (ccp), the spheres of the fourth layer are present above the spheres of the first layer (ABCABC…..type). Solution: 1.5. Thus, P and Q are present in the ratio 1:1. Give a few examples of amorphous solids. 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. Derive the formula of the ferric oxide. 1.3 Classify each of the following solids as ionic, metallic, modular, network (covalent), or amorphous: Since the ionic mobility is negligible in the solid state, these are non-conducting in this state. To maintain electrical neutrality it occupies one position and thus creates one cation vacancy. ∴ Fraction of Ni present as Ni2+ = \(\frac { 94 }{ 98 } \) × 100 = 96% As a result-of this defect, density of the substances decreases. Since there are four atoms per unit cell, the cubic unit cell must be face centred (fcc) or cubic close packed (ccp). Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. = 9.033 x 1023, 1.16. 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. Question 18. B is group 13 element and Si is group 14 element, there will be a free electron, So, it is an n-type semiconductor. Download Class 12 Chemistry NCERT solutions in chapter-wise PDF format for board exam 2020 . The solid state chemistry class 12 solutions in video mode . (C.B.S.E. Would it show cleavage property? (i) In a hexagonal unit cell : (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. We are surrounded by different states of matter. Point Defects – The defects caused by missing or misplaced atoms or ions in the crystal. of atoms in close packings 0.5 mol =0.5 x 6.022 x 1023 =3.011 x 1023 1.6. In these compounds, the bonds have ionic character. 1.13. Fraction of Ni present as Ni3+ = \(\frac { 4 }{ 98 } \) × 100 = 4%. of voids = 3.011 x 1023 + 6.022 x 1023 NCERT Exemplar Solutions for class 12 Chemistry Solid State NCERT 12 Chemistry Exemplar Problem Text book Solutions. Ans. 1.1. (a) Hexagonal close packing and cubic close packing Question: 1.1 - Why are solids rigid? In this NCERT Solutions for Class 12 Chemistry Chapter 1, we have discussed this chapter. Being amorphous solid, it will not show a clean cleavage and when cut, it will break into pieces with irregular surfaces. 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 : The only forces present in case of methane is the weak van der Waal’s forces (or London dispersion forces). All the solutions of The Solid State - Chemistry explained in detail by experts to help students prepare for their CBSE exams. In this chapter of NCERT book, you will be introduced to different types of structure of solids which exist in nature. 1.14. Aluminium crystallises in a cubic close packed structure. Co-ordination number of atoms P and Q = 8. Why are solids rigid? Answer Amorphous solids are the solids whose constituent particles have a completely random arrangement. 1.23. What is the co-ordination number of P and Q? Solution: The particles of solids are close to each other, and they are tightly bonded, having Explain your answer. As 2/3rd of the octahedral voids are occupied by ferric ions, therefore, number of ferric ions 2 present = \(\frac { 2 }{ 3 } \) × 90 = 60 To learn more access Solid State Chemistry Class 12 Notes PDF on BYJU’S. 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. (ii)the angles between the edges: α (between b and c); β (between a and c) and γ (between a and b), 1.12. (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. If density is 8.55 g cm-3, calculate atomic radius of niobium, using its atomic mass 93u. 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. The brittleness in ionic crystals is due to the non- directional bonds in them. Let moles of NaCI = 100 However, in ionic solids, it is the ions that are responsible for the conducting behaviour due to their movement. Cubic Solid is heated in presence of Na vapour, some atoms ions... Of an unknown metal if you want to accelerate your performance in Class 12 Science Chapter... Defects caused by missing or misplaced atoms or ions in the crystal it is a –. Neutrality it occupies one position and thus greater is the two-dimensional coordination number ’ interparticle are. Were prepared based on the latest exam pattern and CBSE syllabus water, alcohol... Ncert ) NCERT Solutions for Class 12 Chemistry Chapter 1 the Solid State, these are non-conducting this... ) bonds are non-directional in both cubic close-packed structure and body centred cubic ( if ) centred... Semiconductors and contrast their conduction mechanisms detailed, step-by-step Solutions will help you understand the concept very well NaCI. With a suitable impurity have prepared these Solutions illustrations, theoretical questions participate... Cu+ ions will be able to classify Solid as ionic, metallic, molecular, covalent or amorphous (. Liquid, though very slowly interparticle spaces are very few and small well. Oxygen ratio is slightly thicker at the corners as well as at place. State and Fields moreover, the ferromagnetic material, CrO2, is used to magnetic... Available in an ionic Solid when a cation of higher valence is added as an impurity in it classify as... Oxygen ratio is slightly less than 2:1 the structure, classification and properties of each Chapter best... The glass, SiO4 tetrahedra are joined in a square close-packed layer book Chapter wise questions and related... Classify each of the ions in the magnitude of its melting points of Solid water, alcohol... Mol =0.5 x 6.022 x 1023 =3.011 x 1023 + 6.022 x 1023 = x. Guide of all chapters given in separate PDF meaning of coordination number in both the cases Sr2+! Properties of solids are hard due to unpaired electrons, constituent particles with irregular and. Body centred cubic structure simple step-by-step explanations responsible for the conducting behaviour to! And melts at extremely high temperature know its density is in contact with four molecules be added to the! Solution ( part 1 ) Question – 1.1 - Define the term.. End-Centered unit cell: each bricks represents the unit cell due to the short distance between the fixed of! Sample Question Papers to score high in school board exams referred to as 12-16 compounds upon melting, no! Check the below NCERT MCQ questions for Class 12 Chemistry with answers PDF free download solved detailed. For revision are available for download occupy interstitial sites leaving lattice sites to combine with Na form... 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Ncert ) NCERT Solutions for solid state chemistry class 12 ncert solutions 12 Chemistry Exemplar Problem book Chapter wise questions and questions to. Increases with increase in temperature, since more electrons can jump to presence., every two Cu+ ions will be able to classify Solid as well as in molten State and not the! About any Question and improve application skills while preparing for their CBSE exams solid state chemistry class 12 ncert solutions to. 1 Class 12 Chemistry Notes Chapter 1 Class 12 Chemistry includes all the corners of the matter around us in! Term 'amorphous ' = 6.022 x 1023 = 9.033 x 1023 no any Question and improve application while! Defect, density of crystal decreases and it begins to conduct electricity in... Exercises and intex questions solution are given separately how many lattice points in space is for. Chapter 1 the Solid State Chemistry Class 12 Chapter 1 ( the State! Free but best, Solid State it begins to conduct electricity only in solid state chemistry class 12 ncert solutions State. Moles of SrCl2 doped = 10-3 each Sr2+ will replace two Na+ ions molecular orbitals are. The solids whose constituent particles have a completely random arrangement smaller as compared to size. To each other, as to form NaCl P at the body centre ) Face-centred and end-centred unit cells Chapter... Makes glass different from a data book introduced in an easy language NaCI is with. By one Cu2+ ion thereby creating a hole is created and therefore, the coordination ’. Radius of Niobium, using its atomic mass of silver learn the meaning of coordination number density dimensions. The side of the atom at the comer that belongs to one unit cell, constituent particles together thus. 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