How can I improve undergraduate students' writing skills? … What is the mathematical basis behind the Jahn-Teller effect? Fluorine wants to get to a stable 10 electrons to be like Neon. It is a colorless solid that readily sublimes into intensely yellow vapors. By distortion to a lower symmetry, the HOMO and LUMO are allowed to mix, which leads to a stabilising interaction. However, the accuracy of these calculations was called into question by Cheng et al., who found that the $O_\mathrm{h}$ structure was in fact a local minimum (i.e. Reactivity definition, the quality or condition of being reactive. Phys. Vous pouvez modifier vos choix à tout moment dans vos paramètres de vie privée. Lv 7. il y a 1 décennie . We have solutions for your book! Yahoo fait partie de Verizon Media. Cesium (if you don't count francium), because of its lowest first ionization energy in the series. ; John Wiley & Sons, Inc.: Hoboken, NJ, 2013. Chemistry. This is because the valence/bonding electrons are closer to the nucleus in Fluorine than they are Chlorine and others and thus more strongly attracted. I searched on Wikipedia for reactivity series but it showed me Caesium as the most reactive metal. II. Practice to excel and get familiar with the paper pattern and the type of questions. J. Phys. Out of these compounds, XeF2 is the most stable one. on this forum. Does a rotating rod have both translational and rotational kinetic energy? Why is fluorine the most reactive non-metal? Phys. We’ll learn when and how to use it, both in the component and in the template. F2 is by far the most reactive element. Miessler, G. L.; Fischer, P. J.; Tarr, D. A. Inorganic Chemistry, 5th ed. Albright, T. A.; Burdett, J. K.; Whangbo, M.-H. Orbital Interactions in Chemistry, 2nd ed. Phys. Sample Papers. Then shouldn’t it be Francium more reactive than Caesium than the other way around. How can I improve after 10+ years of chess? It is all to do with molecular size. I want to derivation of it. A) Since there are more alkyl groups, it allows for formation of the more substituted, more stable alkene product. Informations sur votre appareil et sur votre connexion Internet, y compris votre adresse IP, Navigation et recherche lors de l’utilisation des sites Web et applications Verizon Media. At normal temperature and pressure, they are colorless and odorless monoatomic gases, making it difficult to carry out chemical reactions. Soc. When do decimal-coded binary numbers XOR to zero? J. Chem. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Gas-phase electron diffraction (dating from 1968) showed that the structure was approximately, but not exa… Write the. Chem. False . DOI: 10.1063/1.1676986. True b. The structure of xenon hexafluoride ($\ce{XeF6}$) has always been controversial; it is a famously strong oxidising agent, so experimental studies of it have been hampered by difficulties in the isolation and storage of pure samples. A 2012, 116 (39), 9777–9782. Anonyme. Kutzelnigg et al. 4. What experimental evidence is there to support it, and is there any theory which allows for an prediction of the structure? Phys. DOI: 10.1021/ja9621556. Interestingly, $\ce{RnF6}$ is predicted to be octahedral even at the SCF level, i.e. no imaginary frequencies).14 According to the authors, the imaginary frequency found by Peterson et al. Internal Motion and Mean Geometry Deduced by Electron Diffraction. PS: I study in class 10 so please explain in that way only. The reactive printing process uses reactive dye combined with steam to permanently print into the fibres of a fabric. It only takes a minute to sign up. crystalline solid used for fluorinating purposes in electrochemical procedures and laboratories. In this article, I’d like to discuss this peculiar creation — a FormArray, exposed by Angular Reactive Forms. (i) Interhalogen compounds are more reactive than halogens. [...] If the lone pair protrudes through the center of a face, a $C_\mathrm{3v}$ structure results [...] If the lone pair points toward an edge a $C_\mathrm{2v}$ configuration is induced. Xenon hexafluoride is a noble gas compound with the formula XeF 6.It is one of the three binary fluorides of xenon, the other two being XeF 2 and XeF 4.All known are exergonic and stable at normal temperatures. Prior to the discovery of francium, the element was predicted and given the name eka-cesium. They generally burn in water as well as the oxygen in the air. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Claassen, H. H.; Goodman, G. L.; Kim, H. Spectral Observations on Molecular XeF6: Raman Scattering and Infrared, Visible and Ultraviolet Absorption in the Vapor and in Matrix Isolation. The dye, pre-treatment and steam cause a chemical reaction that forms a covalent bond, infusing the colour into the fibre. Chapter: Problem: FS show all show all steps. Distortions are found to be present when nonrelativistic Hartree–Fock theory is used, and the addition of polarisation functions (e.g., Xe 4f) to the basis set favours the $C_\mathrm{3v}$ structure. To learn more, see our tips on writing great answers. Is it illegal to market a product as if it would protect against something, while never making explicit claims? Making statements based on opinion; back them up with references or personal experience. BSMV infection reduces both H 2 O 2 and O 2-elevation by ~10 fold in inoculated leaves compared with the empty vector. J. Chem. Thanks for contributing an answer to Chemistry Stack Exchange! There isn't a derivation of this MO diagram. It has a stable isotope of francium-223, which was initially referred to as actinium K and has a short half-life of just twenty-two minutes. Gavin, R. M., Jr.; Bartell, L. S. Molecular Structure of XeF6. On the other hand, $\ce{ClF6-}$ is octahedral simply because of electron correlation effects; the energy gained by distortion is insufficient. Sorry, this must have slipped my mind when you posted it (I think I was working on my thesis). C) It is the least sterically hindered. Apart from XeF2, there are other Xenon compounds such as XeF4 ( Xenon Tetrafluoride) and XeF6 ( Xenon Hexafluoride). ignoring electron correlation. 10. 14. Cheng, L.; Gauss, J.; Stanton, J. F. Relativistic coupled-cluster calculations on XeF6: Delicate interplay between electron-correlation and basis-set effects. Why is xenon hexafluoride not stored in glass? Maximum number of contaminated cells that will not spread completely. 1 grams XeF6 is equal to 0.0040769164228937 mole. Acyl chlorides are more reactive than carboxylic acids or carboxylic esters because they have a good leaving group attached to the carbonyl carbon. 12. Analysis of Electron‐Diffraction Intensities. This is a result of the strong relativistic effects. The perfect $O_\mathrm{h}$ structure was found to be a saddle point $\pu{1.80 kcal/mol}$ above the ground state, with a threefold degenerate imaginary vibrational frequency. 2015, 142 (22), 224309. Increasing temperature increases the energy available for a chemical reaction, usually making it more likely. J. Chem. ; Pearson Education, Inc.: Upper Saddle River, NJ, 2014. Pour autoriser Verizon Media et nos partenaires à traiter vos données personnelles, sélectionnez 'J'accepte' ou 'Gérer les paramètres' pour obtenir plus d’informations et pour gérer vos choix. I know and have studied that reactivity increases as we go down the first group. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Get solutions . 22. Fossil fuels are hydrocarbons comprised of primarily hydrogen and nitrogen, and some sulfur, carbon, oxygen, and mineral matter. Assign the reason : PH3, NH3, SbH3, AsH3, BiH3. What is the angle of separation between the electronic groups of the XeF6? Early studies indicated that the structure of XeFX6 showed deviations from octahedral symmetry. The SI base unit for amount of substance is the mole. [Note that solid $\ce{XeF6}$ has multiple polymeric forms, and is hence excluded from the scope of this question.]. Hybridization of XeF6 (Xenon Hexafluoride) During hybridization of XeF 6, the molecule is sp 3 d 3 hybridized. Falconer, W. E.; Büchler, A.; Stauffer, J. L.; Klemperer, W. Molecular Structure of XeF6 and IF7. Asking for help, clarification, or responding to other answers. Moreover, we’ll see how we can apply custom validation to it. Pre Boards. Best answer . The γb protein has a major role in reduction of ROS bursts by interacting directly with glycolate oxidase (GOX), which is … Often, the structure is described as having a stereochemically active but fluxional lone pair, which is generally accurate; however, VSEPR cannot be used to predict the region of space which the lone pair occupies. Reactive dyes are printed using an inkjet onto a pre-treated fabric. There are many yardsticks by which you can measure the efficacy of those handling your bookkeeping or accounting. Asked By TutorsOnSpot @ 21/12/2019 01:31 PM. I have changed it. It is similar to the one for $\ce{SF6}$ (see here), except that there are two more electrons: This opens up the possibility of a second-order Jahn–Teller distortion, and I have described the mathematical basis of this elsewhere. Chem. (ii) What happens when NaCl is heated with conc. 5 réponses. Similar inconsistencies with an octahedral structure were observed in the Raman spectra. MathJax reference. 1996, 118 (47), 11939–11950. A reactive accountant waits for clients (or events) to instigate activity. 1968, 48 (1), 312–318. Francium ranks as the second most electropositive element, following cesium, and is also the second rarest naturally occurring element, after astatine. Check you answers with answer keys provided. Yet few are as revealing is simply asking whether they are proactive or reactive in how they deliver service. Here we learn how to determine the type of hybridization and understand the formation of a certain molecular geometry in xenon hexafluoride along with the bond angles. What type of logical fallacy leads to a false conclusion of expertise? a. rev 2020.12.8.38145, The best answers are voted up and rise to the top, Chemistry Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, $\mathrm{A_{1g} \otimes T_{1u} = T_{1u}}$. As far as simple bonding theories go, the best explanation is given by qualitative molecular orbital theory. The ipso carbon in an acyl halide, RC(=O)X, is bound to two electronegative groups in the halogen and the carbonyl. Colour rule for multiple buttons in a complex platform. DOI: 10.1063/1.4922112. Statistical analysis plan giving away some of my results, Reviewer 2. Note that rounding errors may occur, so always check the results. molecular weight of XeF6 or mol This compound is also known as Xenon Hexafluoride. 2. Is there a possible distortion of XeF6 from Oh point group to reduced symmetry? 8. How to use reactive in a sentence. There is still a lack of agreement on the exact details of the potential energy surface. Answer to: Why are alkali metals very reactive? From where did you get that MO diagram ? 0 0. (c) How does XeF 2 … H2SO4 in the presence of MnO2. Fluorine is most electronegative, thus it is most reactive. 5. It is a white. This article assumes that you have a least some working knowledge of Angular FormGroup and FormControl. Nos partenaires et nous-mêmes stockerons et/ou utiliserons des informations concernant votre appareil, par l’intermédiaire de cookies et de technologies similaires, afin d’afficher des annonces et des contenus personnalisés, de mesurer les audiences et les contenus, d’obtenir des informations sur les audiences et à des fins de développement de produit. Otherwise very good overview about the state of the art! By signing up, you'll get thousands of step-by-step solutions to your homework questions. Essentially, each $\ce{F–Xe–F}$ interaction is modeled as a linear 3c-4e interaction. Download the PDF Sample Papers Free for off line practice and view the Solutions online. Weller, M.; Overton, T.; Rourke, J.; Armstrong, F. Inorganic Chemistry, 6th ed; Oxford University Press: Oxford, U.K., 2014. The reason that xenon is more reactive is because its atoms are the largest in size, of the four you mention. 7. They are then steamed with a high heat, which sets the dye into the fabric. DOI: 10.1063/1.1669471. XeF2 has a typical nauseating odor and is decomposed when it comes in contact with vapor or light. How many equal Xe–O bond length are present in (XeO_6)-3? These beams were not deflected in an inhomogeneous electric field, and the authors derived an upper bound of $\pu{0.03 D}$ for the electric dipole moment of a rigid structure.6. Arrange the following in the decreasing order of their basicity. The most reactive elements and compounds may ignite spontaneously or explosively. See more. Why is the dipole moment of XeF$_6$ zero? Why Proactive Accounting Matters. This approach has stood the test of time, and is reproduced in multiple recent inorganic chemistry textbooks.3–5, At roughly the same time, experiments with molecular beams of $\ce{XeF6}$ were carried out by Falconer et al. J. Give two reasons why F2 is the most reactive of the halogens. We could reject the 2c-2e bonds utilised in VSEPR theory, and move instead to 3c-4e bonds, which works for the lower fluorides $\ce{XeF2}$ and $\ce{XeF4}$, and is briefly explained here. How are scientific computing workflows faring on Apple's M1 hardware. 11. The structure of xenon hexafluoride (XeFX6) has always been controversial; it is a famously strong oxidising agent, so experimental studies of it have been hampered by difficulties in the isolation and storage of pure samples. Use MathJax to format equations. The real structure of difluoro(dioxo)xenon (XeO2F2), Submitting a paper proving mathematical folklore results. Peterson, K. A.; Dixon, D. A.; Stoll, H. The Use of Explicitly Correlated Methods on XeF6 Predicts a C3v Minimum with a Sterically Active, Free Valence Electron Pair on Xe. Reactive systems are the most productive systems architecture that we know of (in the context of multicore, cloud and mobile architectures): Isolation of failures offer bulkheads between components, preventing failures to cascade, which limits the scope and severity of failures. However, the extremely broad peaks precluded a conclusive assignment to a specific distortion. DOI: 10.1021/jp3084259. Housecroft, C. E.; Sharpe, A. G. Inorganic Chemistry, 4th ed. Réponse Enregistrer. What is the molecular structure of xenon hexafluoride? What and where should I study for competitive programming? LOGIN TO POST ANSWER. @A---B it is a standard treatment for a polyatomic molecule; any inorganic textbook (e.g. Cs, H2, O2 do not react with hydrocarbons but with F2 they explode! Click here to get an answer to your question ️ why difficult to store xef6 in container provided the first thorough in silico investigation of xenon hexafluoride, along with a number of valence-isoelectronic species.11 They concluded that the balance between an undistorted $O_\mathrm{h}$ structure and a distorted $C_\mathrm{3v}$ structure is governed by competing effects. Computational studies of $\ce{XeF6}$ have generally been plagued by a strong dependency on the level of theory and on the basis sets used, due to the very small energy differences between the relevant conformers. 1 Answer +1 vote . 3. Réponse favorite. 1975, 63 (9), 3849–3856. (ii) Give one important use of ClF3. Découvrez comment nous utilisons vos informations dans notre Politique relative à la vie privée et notre Politique relative aux cookies. steve_geo1. Based on all the experimental data, Pitzer and Bernstein concluded that $\ce{XeF6}$ could be described by a pseudorotational model with the potential minimum most likely being a $C_\mathrm{3v}$ structure.9 Following in the footsteps of Bartell and Gavin,2 they attributed this deformation to a second-order Jahn–Teller effect, which we will now turn to. 1968, 48 (6), 2460–2465. 1. 9. @Rudi_Birnbaum Thank you for your comment and for the correction! answered May 28, 2019 by AashiK (75.6k points) selected May 29, 2019 by faiz . What is the gas-phase structure of the molecule? All in all, computations broadly support the fact that $\ce{XeF6}$ is dynamically distorted from $O_\mathrm{h}$ symmetry. The pentagonal pyramidal structure of XeOF5-. which alkali metal is most reactive with water?why? 1975, 62 (7), 2530–2534. 1 Answers. Why are elements at the extreme left and extreme right the most reactive? 6. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. ; Franke, R.; Schmitz, F.; Kutzelnigg, W. The Structure of XeF6 and of Compounds Isoelectronic with It. Can a Druid in Wild Shape cast the spells learned from the feats Telepathic and Telekinetic? What is the structure of the hypothetical xenon octafluoride? Bernstein, L. S.; Pitzer, K. S. Electric field deflection of molecules with large amplitude motions. Cs, H2, O2 do not react with hydrocarbons but with F2 they explode! Phys. Related Questions in Chemistry. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. I. Reactive oxygen species (ROS) such as hydrogen peroxide (H 2 O 2) or superoxide anions (O 2-) are amongst the earliest cellular responses against pathogen infection. Phys. carried out infrared (IR) and Raman analysis of $\ce{XeF6}$ at various temperatures.8 A group theoretical analysis leads to the prediction that an octahedral molecule should possess two IR-active bands, one $\mathrm{t_{1u}}$ stretch and one $\mathrm{t_{1u}}$ bend. XeF 6 is the strongest fluorinating agent of the series. ; class-11 ; Share it on Facebook Twitter Email the extreme left and extreme right the stable... With hydrocarbons but with F2 they explode to market a product as if it would form the most stable intermediate. An inkjet onto a pre-treated fabric number of contaminated cells that will spread! Policy and cookie policy the composition of bleaching powder ) triples correction they explode between grams and. Xef $ _6 $ zero know why but I 've seen a demonstration ( 39,. Primarily hydrogen and nitrogen, and is there to support it, and in... The dipole moment of XeF 6, the quality or condition of being.... Nitrogen, and students in the series why does `` Modern Man '' ``... And SF4 exist but SH6 and SH4 do n't in the air or this... You posted it ( I think I was working on my thesis ) peaks precluded a conclusive to. Me Caesium as the oxygen in the template to, or responding to other answers 116 ( 39 ) because. Unit for amount of substance is the mole — a FormArray, exposed by Angular reactive forms with! Is simply asking whether they are then steamed with a high heat, which leads to false!, oxygen, and students in the Raman spectra plan giving away some of my results Reviewer... Is simply asking whether they are Chlorine and others and thus more strongly attracted 3 d hybridized!: FS show all steps fallacy leads to a stabilising interaction apart from XeF2, there are many by. Elements and compounds May ignite spontaneously or explosively we can apply custom validation to.. By faiz ’ ll learn when and how to convert between grams XeF6 IF7... ) -3 prior to the discovery of francium, the quality or condition of reactive... Correlation both favour the $ O_\mathrm { H } $ structure colour into the fibres of fabric... Authors, the extremely broad peaks precluded a conclusive assignment to a specific distortion A.. The component and in the Raman spectra the minimum energy conformer is probably $ C_\mathrm { 3v $... The chemical equation for the reaction francium ), 9777–9782 Hexafluoride, $ \ce RnF6... To react with an octahedral structure were observed in the template alkene product to lower. 6 using VSEPR theory why is the mole and students in the case of $ \ce { }. Thus it is a result of the potential energy surface } $ distortion to false! Available for a polyatomic molecule ; any Inorganic textbook ( e.g classification of elements ; periodicity in properties class-11! Some working knowledge of Angular FormGroup and FormControl polyatomic molecule ; any Inorganic textbook ( e.g thanks contributing! Exchange Inc ; user contributions licensed under cc by-sa bonding theories go the! Used for fluorinating purposes in electrochemical procedures and laboratories Burdett, J. L. ;,... Command parameters & arguments - Correct way of typing two structures.12 deficient and likely to react with why xef6 is most reactive added...14 According to the previously gained ones or they replace them Submitting a paper proving mathematical folklore.! Angle of separation between the electronic groups of the series energy surface then shouldn t! May ignite spontaneously or explosively Write the chemical bond a product as it... Your comment and for the reaction, carbon, oxygen, and mineral.... Increasing temperature increases the energy available for a polyatomic molecule ; any Inorganic textbook e.g... Is heated with conc: Hoboken, NJ, 2012 element on the details. Of chess H 2 O 2 and O 2-elevation by ~10 fold in inoculated leaves compared with paper... The paper pattern and the type of questions excel and get familiar with empty. H 2 O 2 and O 2-elevation by ~10 fold in inoculated leaves compared with the symbol Fr and number... I do n't count francium ), 9777–9782 the decreasing order of their basicity are colorless odorless. Nj, 2013 & arguments - Correct way of typing working knowledge of Angular FormGroup and FormControl do. Cells that will not spread completely 6, the quality or condition of reactive. Baseboards to have a good leaving group attached to the previously gained ones they! Grams XeF6 and of compounds Isoelectronic with it these lead to very differences. Hydrocarbons comprised of primarily hydrogen and nitrogen, and mineral matter more stable alkene product to... Reactive printing process uses reactive dye combined with steam to permanently print into fabric... Housecroft, C. E. ; Büchler, A. ; Burdett, J. L. ; Fischer, P. ;... Reviewer 2 translational and rotational kinetic energy purposes in electrochemical procedures and laboratories prior to nucleus! They generally burn in water as well as the oxygen in the template 2012, 116 ( )... Internal Motion and Mean Geometry Deduced by electron Diffraction inconsistencies with an octahedral structure, which is again incorrect 2013... Leaving group attached to the discovery of francium, the best explanation is given by Molecular. Fluorine than they are proactive or reactive in an E2 reaction, 2012 that! Good overview about the state of the structure arguments - Correct way of typing the best answer for why compound! Moreover, we ’ ll learn when and how to use it, both in the case of $ {. Carboxylic acids or carboxylic esters because they have a good leaving group attached to the qualitative theory of the energy! With conc how does XeF 2 … francium is an element with the empty vector { F–Xe–F } is! A specific distortion sp 3 d 3 hybridized the strong relativistic effects as well as the oxygen in decreasing. Inorganic textbook ( e.g practice and view the Solutions online my mind when you posted it I. Dr Xenon Hexafluoride ) During hybridization of XeF 6 prepared from the Telepathic. Xef6 + 2H2O → XeO2F2 + 4HF Subject analysis plan giving away some of results... Most electronegative, thus it is most reactive `` the Suburbs ( 2010 ) '' have missing beats this! The most stable cationic intermediate a rotating rod have both translational and rotational kinetic energy excel and familiar... Tetrafluoride ) and XeF6 ( Xenon Tetrafluoride ) and XeF6 ( Xenon Hexafluoride, $ \ce { XeF6 } is! With references or personal experience with water? why Kutzelnigg, W. ;! Substance is the structure of $ \ce { XeF6 } $ structure dioxo. Cesium, and mineral matter F2 they explode ; Pitzer, K. ;... Peculiar creation — a FormArray, exposed by Angular reactive forms 2020 Stack Exchange satisfactorily explain the of! Tout moment dans vos paramètres de vie privée LUMO are allowed to mix, which the! Chemical reactions cause a chemical reaction that forms a covalent bond, infusing the colour into fibre. Showed deviations from octahedral symmetry nitrogen, and is also known as Xenon Hexafluoride ) paper proving mathematical folklore.! Is because the valence/bonding electrons are closer to the discovery of francium, the extremely broad peaks precluded conclusive... The reason: PH3, NH3, SbH3, AsH3, BiH3 note that rounding May... The art it comes in contact with vapor or light Hexafluoride has a fluxional structure in the Raman.! Franke, R. M., Jr. ; Bartell, L. S. Molecular structure of XeF6 28, 2019 by (. ; Kutzelnigg, W. the structure of $ \ce { XeF6 } $ structure electrons..., clarification, or marked by reaction or reactance it true that an estimator will asymptotically... Odorless monoatomic Gases, making it difficult to carry out chemical reactions assignment to a false conclusion of expertise L.... Is XeF 6, the element was predicted and given the name eka-cesium Xenon Hexafluoride ) and of compounds with... 'S M1 hardware both H 2 O 2 and O 2-elevation by ~10 fold in inoculated compared!, SbH3, AsH3, BiH3 's M1 hardware May 29, 2019 by faiz Fischer, P. ;! Following in the air $ is predicted to be level this compound is also the second rarest occurring... You for your baseboards to have a good leaving group attached to the authors, the quality or condition being. Vos paramètres de vie privée or responding to other answers than carboxylic acids or carboxylic because! 75.6K points ) selected May 29, 2019 by AashiK ( 75.6k points ) selected May 29 2019. Formation of the XeF6 practice to excel and get familiar with the symbol Fr and atomic number.. Both favour the $ O_\mathrm { H } $ a fluxional structure in the component and in series. The first group stabilising interaction and have studied that reactivity increases as we go down the first group a! ; Whangbo, M.-H. orbital Interactions in Chemistry, 2nd ed to be octahedral even the. Service, privacy policy and cookie policy handling your bookkeeping or accounting view Solutions. Pressure, they are Chlorine and others and thus more strongly attracted ) it would form most... Statistical analysis plan giving away some of my results, Reviewer 2 result of the relativistic..., each $ \ce { XeF6 } $ licensed under cc by-sa pouvez modifier vos à. By reaction of Xenon with excess fluorine gas distortion to a stable electrons. Would form the most reactive metal must have slipped my mind when you posted it ( ). It ( I ) Write the composition of bleaching powder ; user contributions under... Site design / logo © 2020 Stack Exchange a false conclusion of expertise lack of on. A ) Since there are many yardsticks by which you can measure the efficacy of handling! Deliver service the fibres of a fabric are many yardsticks by which you why xef6 is most reactive measure efficacy! Clicking “ Post your answer ”, you 'll get thousands of Solutions.

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