It does not influence the density of the substance. Frenkel defects are mostly exhibited in ionic solids where the smaller ion (usually the cation) is dislocated. As due to size difference in ions, ion occupies interstitial position in lattice. There is also no significant impact of Frenkel defect on the density of the solid and therefore both the volume and mass of the solid is preserved. show Schottky defect.Â, Compounds such as NaCl, ZnS, AgI etc. Both anion and cation leave the solid crystal. It is a type of point defect which is also known as dislocation defect. It was discovered by soviet physicist Yakov Frenkel. An ionic material experience both frenkel and schottky defect but there are some differences between them. This type of defect is called Frenkel defect. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 1 The Solid State with Answers Pdf free download. Find out NCERT Solutions for Class … The Frenkel defect is a type of defect shown by crystalline solids. Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal. We have listed the main ones below. Thus, a vacancy is created in the lattice. A Frenkel defect is caused if some of the ions of a lattice occupy the interstitial sites by leaving a corresponding number of normal lattice sites vacant. This defect occurs only when cations are smaller when compared to the anions. Sorry!, This page is not available for now to bookmark. In Schottky defect the difference in size between cation and anion is small. NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions Class 11 Business Studies, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, 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, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 8 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions For Class 6 Social Science, CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, Important Questions For Class 11 Chemistry, Important Questions For Class 12 Chemistry, CBSE Previous Year Question Papers Class 10 Science, CBSE Previous Year Question Papers Class 12 Physics, CBSE Previous Year Question Papers Class 12 Chemistry, CBSE Previous Year Question Papers Class 12 Biology, ICSE Previous Year Question Papers Class 10 Physics, ICSE Previous Year Question Papers Class 10 Chemistry, ICSE Previous Year Question Papers Class 10 Maths, ISC Previous Year Question Papers Class 12 Physics, ISC Previous Year Question Papers Class 12 Chemistry, ISC Previous Year Question Papers Class 12 Biology. A Frenkel defect is another form of a point defect which is created when an atom or cation leaves its original place in the lattice structure to create a vacancy while occupying another interstitial position within the solid crystal. Schottky defect occurs in those ionic crystals where difference in size between cation and anion is small. Frenkel defect doesn’t have any impact on density, mass or volume of the crystal as in this defect migration of ions takes place within the crystal. (c) Frenkel Defects: It is a type of vacancy defect. Pro Subscription, JEE When an atom or smaller ion (generally a cation) leaves its place in the lattice, creating a vacancy and becomes an interstitial by lodging in a nearby location. Put your understanding of this concept to test by answering a few MCQs. In this type of defect, density remains same. Frenkel defect contains ionic crystals where the anion is larger than the cation. It might be thought of as being formed by a cation leaving its normal position and moving into an interstitial site. Pro Lite, Vedantu We have provided The Solid State Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. In it, one of the cations occupies a position in the interstitial space instead of its own fixed site. We will discuss the Frenkel defect in this article in detail. Definition of Frenkel defect asked Dec 16, 2019 in Chemistry by Kajal01 (25.7k points) class-12 +2 votes. 2)The presence of this defect does not alter the density of the solid. The Frenkel defect does not found in pure alkali metal halides because the size of cation is too big to be accommodated in the interstitial place. Meanwhile, Silver Bromide also shows another form of point defect known as Schottky defects. This defect is observed in solids when the difference in ionic … Class-12-science » Chemistry. Repeaters, Vedantu As the number of cations and anions remain equal. This type of defect is called Frenkel defect. Silver bromide (AgBr) shows both Schottky and Frenkel defect. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. class-12; Share It On Facebook Twitter Email. It was discovered by soviet physicist Yakov Frenkel. Frenkel defect is also known as interstitial defect. Thus, it can be said that Frenkel defects are shown by those ionic solids which have large size differences between the cation and anion.Â. Frenkel Defect Definition When an atom or smaller ion (generally a cation) leaves its place in the lattice, creating a vacancy and becomes an interstitial by lodging in a nearby location. Calculation of Number of Frenkel DefectsÂ, = enthalpy released by 1 Frenkel defect      Â, Difference between Schottky and Frenkel Defect, Electrostatics - Definition, Example & Explanation, Vedantu These defects exist in addition to Schottky and Frenkel defects. Due to this, the crystal structure becomes irregular and defects arise. 2) Frenkel defects: This defect is found in silver halides such as AgCl, AgBr and AgI because of the small size of the Ag+ ion. answered Nov 1, 2018 by ... defect is shown by the ionic solids having significantly small difference in their cationic and anionic radius whereas Frenkel defect is shown by ionic solids having large difference in their cationic and anionic radius. Click ‘Start Quiz’ to begin! Characteristic of Frenkel Defect This defect occurs only when cations are smaller when compared to the anions. CBSE > Class 12 > Chemistry 0 answers An aromatic compounds A on treatment with CHCl3 and KOH gives two compounds which gave the same product with Zn dust oxidation of B and C with molecular formula C7H6O2 Sodium Salt of gives D which may be obtained by distilling A In other words, the interruptions in regular patterns in crystalline solids is called crystallographic defects. In ionic compounds, some of the ions (usually smaller in size) get dislocated from their original site and create defect. Yakov Frenkel, a Russian physicist was the person who discovered the Frenkel defect while conducting research on the molecular theory of condensed state. ... point defect. Conditions for the formation of Frenkel defect: a. Frenkel defect occurs in ionic compounds with large difference between sizes of cation and anion. Solid crystals also show some kinds of defects which we study in solid state chemistry. It is named after a Soviet physicist Yakov Frenkel and is different from Schottky defect in terms of its occurrence and characteristics. Explain how you can determine the atomic mass of an unknown metal if you know its mass density and the dimensions of unit cell of its crystal. These imperfections of crystals are called defects in crystals. CBSE > Class 12 > Chemistry 2 answers Yogita Ingle 4 months, 1 week ago Frenkel defect :- If an ion is missing, from its lattice site and is occupies the interstitial site, electrical neutrality as well as Stoichiometry of the compound are maintained this type of defect is called frenkel defect. When schottky defect occurs in non-ionic crystals, it is termed vacancy defect. If you want to get complete NCERT Solution of CBSE Class XII Chemistry Unit-I Solid State, then register yourself on Vedantu and download free PDFs of NCERT Solutions. It is a type of point defect which is … c. This defect is found in ionic crystals like ZnS, AgCl, AgBr, AgI and CaF 2. In such cases, substances also maintain their electrical neutrality. It is also called dislocation defect. A Frenkel defect is another form of a point defect which is created when an atom or cation leaves its original place in the lattice structure to create a vacancy while occupying another interstitial position within the solid crystal. Following are examples of Frenkel Defect –, NaCl (Sodium Chloride) (Frenkel Defect is shown in NaCl in the image above), When the ionic compound size of anions is much larger than cations then Frenkel Defect occurs. 1 answer. show Frenkel defect.Â. b. Frenkel defect: A Frenkel defect is caused if some of the ions of a lattice occupy the interstitial sites by leaving a corresponding number of normal lattice sites vacant. Why is Frenkel defect produced in solid crystal? Some examples include AgBr, ZnS, AgCl, and AgI. The compounds that often depict the schottky defect include NaCL, TiO 2, KBr and KCL. Thus, a vacancy is created in the lattice. An ionic compound shows the same in Frenkel and Schottky defect. These defects are known as Non – Stoichiometric Defects. Required fields are marked *. ... Class 10 Class 12. In Schottky defect, both cation and anion leave the solid crystal. Usually, this type of defect is observed in ionic solids, where size of anion is substantially larger than the size of cation. (All India) 2011 Frenkel defect is also called dislocation defect. why is Frenkel defect produced in solid Crystal . 1) Schottky defect: The ionic compounds such as NaCl, KCl, KBr, AgBr and CsCl show this defect. The Solid State ... Frenkel Pairs: One such type of defect involves a cation-vacancy and a cation- interstitial pair. The Questions and Answers of The difference between schottky and frankel defect are solved by group of students and teacher of Class 12, which is also the largest student community of Class 12. Meaning of defect is shortcomings or imperfections. In Frenkel defect, only the smaller ion (cation) leaves its original lattice site; whereas, the anion remains in original lattice sites. Normally, this defect occurs in crystal lattice with ions of equal size whereas the frenkel defect usually occurs in lattices with ions of different sizes. In this defect, the density of the substance increases. Usually the smaller ion cation leaves its original lattice structure. b) ZnO becomes yellow on heating due to frankel defect, when ZnO is heated, it loses oxygen reversibly and turns yellow in colour. Schottky defect decrease the density solid where as no such defect arise due to frenkel defect. Recommend (0) Comment (0) ASK A QUESTION ... S 7, S 9, S 10, S 11,S 12, S 18 and S 20 rings have been made by Schmidt and his group. Pro Lite, NEET Since this defect arises because of dislocation of ions, thus it is also known as Dislocation Defects. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Frenkel Defects can be calculated using the equation given below: Delta H = the enthalpy formation of one Frenkel defect. This discussion on The difference between schottky and frankel defect is done on EduRev Study Group by Class 12 Students. The Solid State Class 12 Important Questions Short Answer Type – I (SA – 1) Question 46. Your email address will not be published. Frenkel defect. 2. In this defect, a cation (or an anion) is dislocated from its normal site to interstitial site. Ionic crystals having Frenkel defect also remain neutral in nature. Frenkel Defect is one type of point defect where an atom (better to say ion, especially cation) leaves its original lattice site and occupies an interstitial position on the same crystal. Frenkel defect is shown by those in which there is large difference in the size of cations and anions. So, density, mass and volume of the ionic crystal remain the same even after having a Frenkel defect. Frenkel Defect: Frenkel defect is also a point crystallographic defect which is usually observed in ionic compounds. Hence, Frenkel defect is shown by AgCl due to small size of Ag+ ion but not by NaCl because alkali metal ions can not fit into interstital sites. Main & Advanced Repeaters, Vedantu Frenkel defect: 1) When cation or anion from ionic solid leaves its regular site and moves to occupy a place between the lattice site called interstitial position, the defect is called interstitial defect or Frenkel defect. This type of defect is called Frenkel defect. Frenkel defect is shown by ionic substance in which there is a large difference in the size of ions, for example, ZnS, AgCl, AgBr and AgI shows this effect due to small size of Zn 2+ and Ag + ions. Frenkel Defect: This defect is exhibited by the ionic substances due to the large difference in size of ions. Interstitial site is the place between the lattice sites. a) Frenkel defect is not found in the pure alkali metal halides because this defect is due to vacancy of ion ,which is shifted in interstitial spaces and because the ions are too large and cannot get into interstitial sites. Frenkel defect:- If an ion is missing, from its lattice site and is occupies the interstitial site, electrical neutrality as well as Stoichiometry of the compound are maintained this type of defect is called frenkel defect. The defect is also known as dislocation defect and it also clearly depicts both vacancy and self-interstitial defects. It does not influence the density of the substance. Select the correct answer and click on the “Finish” buttonCheck your score and answers at the end of the quiz, Visit BYJU’S for all Chemistry related queries and study materials, Your email address will not be published. A non-ionic compound mainly shows vacancy and interstitial defects. The Frenkel Defect in a Molecule In order for the Frenkel defect to occur in an atom, it requires a low coordination number as well as have the crystal lattices open for the molecule. 2. Frenkel defect: If an ion is missing from its correct lattice sites (causing a vacancy or a hole) and occupies an interstitial site, electrical neutrality as well as stoichiometry of the compounds are maintained. Even few crystalline ionic compounds such as silver bromide exhibit both Schottky and Frenkel defects as well.Â, In these defects ions leave from a crystal lattice in stoichiometric units. Â, In these defects ions leave its place in lattice but remain in the interstitial space of crystal lattice.Â, It doesn’t affect the density of the atom or lattice.Â, Due to this effect mass of the lattice is reduced.Â, Due to this effect mass of the lattice or atom remain unaffected.Â, In these defects ions leave crystal lattice.Â, In these defects ions just leave their position in the lattice.Â, Schottky defect is occurred in those crystals in which sizes of ions is almost similar.Â, Frenkel defect is occurred in those ionic crystals in which sizes of ions (anions and cations) show large differences.Â, Compounds such as KCl, KBr, CsCl etc. The Solid State. The Frenkel defect (also known as the Frenkel pair/disorder) is a defect in the lattice crystal where an atom or ion occupies a normally vacant site other than its own.