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    Which of the following statements is TRUE? Write the electronic configuration and observe the unpaired, Find the Odd one out (a) K4[Fe (CN)6] (b) Na [Ag (CN)2] (c) K2[Zn (CN)4] (d [Cu (NH3)4 ]SO4, The following is a list of metals : Na, Mg, Al, Zn, Fe, Pb, Cu and Au. O-2 is paramagnetic due to the presence of one unpaired electron. from 58Ce to 71Lu placed in 6th period of long form of periodic table is known as lanthanoids (or lanthanide series). Our videos will help you understand concepts, solve your homework, and do great on your exams. To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? (v)    The compounds of these metals are usually paramagnetic in nature. Doubtnut is better on App. 232, Block C-3, Janakpuri, New Delhi, Here we will separately discuss the detailed application of ESR in detecting each paramagnetic species in the following sections. So, Mg+2 is also diamagnetic because all its electrons are paired up. So, F- is also diamagnetic because all its electrons are paired up. Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number? For example, Mn exhibits all oxidation states from +2 to +7 as it has 4s23d5 configuration. 2020 Zigya Technology Labs Pvt. Which of the following species is paramagnetic? Let us help you simplify your studying. Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is : (A) Be2 (B) B2 (C) C2 (D) N2 Sir, plz explain why (C) is the answer of the above question. Therefore, [Zn(NH 3) 6] 2+ is an outer orbital complex and is diamagnetic. of other element. Be 2. 469 Views 8. Arrange Cu, Ca, Al, Fe, Mg, Pb, Na and Zn in the decreasing order, in which they appear in the activity series. 1. remains half filled) and electronic repulsion is the least and nuclear charge increases. Which of the d-block elements may not be regarded as the transition elements? Vapour pressure of water at 298 K is 23 mm. Fe2+ to Zn2+ it changes from d6 to d10). B) The orbitals on the carbon atom are sp 2 hybridized. (iv)    Compounds of transition metals are usually coloured. Which among the following is a paramagnetic material? (a) X, Y and Z are coded letters for three of the metals in the activity series. Cl^(o): [He]2s^(2)2p_x^2p_y^2p_z^1 + e^- => Cl^(-): [He]2s^(2)2p_x^2p_y^2p_z^2 (All orbitals are filled (i.e., … It is due to its characteristic electronic configuration i. e., (n – 1)d and ns electrons take part in bond formation either by loosing or by sharing of electrons with other combining atoms.The stability of oxidation state depends mainly on electronic configuration and also on the nature of other combining atom.The elements which show largest number of oxidation states occur in or near the middle of series (i.e., 4s23d3 to 4s23d7 configuration). Choose the paramagnetic species from below. If you are having trouble with Chemistry, Organic, Physics, Calculus, or Statistics, we got your back! Name an ore of one of the. Arrange Ca, Pb, Fe, Na, Zn, Cu, and Al in the decreasing order of their reactivity. I believe C2 2+ is the only paramagnetic species. a) 5 b) 7 c) 6 d) 1 e) 2. b) 7. 9 - These questions are not designated as to type or... Ch. What is lanthanoid contraction? Paramagnetic Substances: Paramagnetic substances are the substances which have unpaired electrons. Thus electronic configuration, to large extent, the existence and stability of oxidation states.The other factors which determine stability of oxidation state are:(i) Enthalpy of atomisation (ii) Ionisation energy (iii) Enthalpy of solvation (iv) E.N. A group of fourteen elements following lanthanum i.e. It is said to be paramagnetic. The important characteristics of transition metals are:(i)    All transition elements are metallic in nature, e.g., all are metals. A) O 2 B) N 2 C) F 2 D) CO E) NO + Q2. It results in the stronger force of nuclear attraction of the 4f electrons and the outer electrons causing decrease in size.Consequences of lanthanoid contraction:(i)    Similarly in the properties of elements of second and third transition series e.g. Illustrate your answer with example. The paramagnetic species among the following is - Na^+, Zn^2+, Cu^+, Fe^3+, Paramagnetic species have at least one unpaired electron. However, the electronic configuration of all the tripositive ions (the most stable oxidation state of all lanthanoids) are of the form 4f n(n = 1 to 14 with increasing atomic number). NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. The species which is not paramagnetic among the following is. Sr and Hf; Nb and Ta; Mo and W. This resemblance is due to the similarity in size due to the presence of lanthanoids in berween. Which one of the following species is paramagnetic? Paramagnetic: Mercury: Diamagnetic: Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc. Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! Question-3) Among the following ions, which one will have highest paramagnetic behavior. (vii)    These metals form various alloys with other metals of the series. 1.10 x 10^2. If an electron is paired (i.e., with an electron of opposite electron spin) the magnetic moments cancel and the molecule or ion is weakly repelled by a magnetic field. Identify the number of valence electrons in Cl^-1. You can determine whether the net effect in a sample is diamagnetic or paramagnetic by examining the electron configuration of each element. Posted 5 years ago (iii) They are chemically inert but retain metallic conductivity. These elements constitute one of the two series of inner transition elements or f-block.Lanthanoid contraction: In the lanthanoide series with the increase in atomic number, atomic radii and ionic radii decrease from one element to the other, but this decrease is very small. La. e) All of the above are paramagnetic. Paiye sabhi sawalon ka Video solution sirf photo khinch kar. [Inner orbital or low spin complex] (6NH 3 molecules) (d) Electronic configuration of Zn 2+ in [Zn(NH 3) 6] 2+. Education portal for Homework help, IIT JEE, NEET. D. N 2. Hence MnSO 4.4H 2 O shows greater paramagnetic nature. Calculate the total energy (in kJ) contained in 1.0 mol of photons, all with a frequency of 2.75 x 10^8 MHz? C) The ion has three resonance structures. 2. Other examples are : VH0.56, TiH1.7 Some main characteristics of these compounds are:(i) They have high melting and boiling points, higher than those of pure metals. Simultaneously an electron is also added which enters to the inner f subshell. configuration, which makes all these four deficient of unpaired electrons and thus they all are diamagnetic whereas all rest of the lanthanoids have atleast one or more unpaired electron which makes them paramagnetic. Sc3+ Cl− Ba2+ Se. Check Answer and Solutio Whereas there is only one unpaired electron in Cu 2+ and hence CuSO 4.5H 2 O shows lowest degree of paramagnetism. Among the following, the paramagnetic compound is a. Na2O2 b. O3 c. N2O d. KO2Sol. Ne^o:[He]2s^(2)2p_x^2p_y^2p_z^2 => Ne^+:[He]2s^(2)2p_x^2p_y^2p_z^1 + e^- (2p_z orbital is paramagnetic) Be^o:[He]2s^2 => Be^+[He]2s^1 + e^- (2s orbital is paramagnetic). It may be noted that atoms of these elements have electronic configuration with 6s2 common but with variable occupancy of 4f level. https://www.zigya.com/share/Q0hFTjEyMDY4NjAy. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. The paramagnetic species among the following is - Na+, Zn2+, Cu+, Fe3+ (A) Na+ (B) Zn2+ (C) Cu+ (D) Fe3+ Common Properties: 02 O (02)- 0 (02)2+ (02)2- 0 (02)+ © Lets see why remaining are not paramagnetic. Have you registered for the PRE-JEE MAIN PRE-AIPMT 2016? Some borides of transition elements approach diamond in hardness. These small atoms enter into the void sites between the packed atoms of crystalline transition metals and form chemical bonds with transition metals. are trapped inside the crystal lattices of metals. The paramagnetic species among the following is -. D Question 6 3 pts Among O2, (O2), (02)2+ (02), and (02)2-, Which of the following species is paramagnetic? Ca. In 2nd half of first row transition elements, electrons starts pairing up in 3d orbitals. Best Answer 100% (3 ratings) and * orbital can have maximum of 2 electrons and * orbital can have maximum of 4 electrons order of filling of orbitals is: 1s *1s 2s *2s 2p 2p *2p *2p a) 1 C atom have 6 view the full answer. Why are such compounds well known for transition metals? C. C 2. Open App Continue with Mobile Browser. So, Na+ is diamagnetic because all its electrons are paired up. C2 2+ has the same number of electrons as B2, and since B2 is paramagnetic, so is C2 2+. More than one answer may apply. A transition element may be defined as a element whose atom or at least one of its simple ions contain partially filled d-orbitals, e.g., iron, copper, chromium, nickel etc.The general characteristic electronic configuration may be written as (n – 1)d1–10ns1–2.The elements of group 12 i.e., Zinc, Cadmium, and Mercury are generally not regarded as transition elements as their atoms and all ions formed have completely filled d-orbitals i.e., these do not have partially filled d-orbitals in atomic state or common oxidation state (Zn2+, Cd2+, Hg2+).Zn (30) = [Ar] 4s2 3d10 Zn2+ = [Ar] 3d104s°Cd (48) = [Kr] 5s2 4d10 Cd2+ = [Kr] 4d105s°Hg (80) = [Xe] 6s2 5d10 Hg2+ = [Xe] 5d106s°. Write the electronic configuration and observe the unpaired orbital. The lesser number of oxidation states at extreme ends arise from either too few electrons to loose or share (e.g. A) Cu B) Y^3+ C) Ne D) Zn^2+ E) Ra. The paramagnetic property is because of the unpaired electron. One of the main characteristic of a transition element is that it can show large variety of oxidation states in its compounds. What are the characteristics of the transition elements and why are they called transition elements? Physics. Improve concepts using videos, connect with students and teachers globally. They are called transition elements because of their position in the periodic table. (Ti2+ to Mn2+ electronic, configuration changes from 3d2 to 3d5 but in 2nd half i.e. In these elements, the last electron enters the 4f-subshells (pre pen ultimate shell). Post questions you can’t solve, Past exam questions with answers, large question bank. (ii) They are very hard. Solution: If (2s-2p) mixing is not operative, then. B. Which of the following species is paramagnetic ? Build your reputation. QUESTION: 5. Which of the following statements about the CO 3 2– ion is false? So these are diamagnetic. Paramagnetism is due to the presence of one or more unpaired electrons in a species. In the presence of strong field ligand NH 3, pairing of electrons takes place and thus, octahedral complex, [Co(NH 3) 6] 3+ is diamagnetic. 9 - The nitrosyl ion. The shielding effect of f-orbitals in very poor due to their diffused shape. La3+ and Ce4+ have 4f0 configuration whereas Yb2+ and Lu3+ have 4f14configuration, which makes all these four deficient of unpaired electrons and thus they all are diamagnetic whereas all rest of the lanthanoids have atleast one or more unpaired electron which makes them paramagnetic. Paper by Super 30 Aakash Institute, powered by embibe analysis.Improve your score by 22% minimum while there is still time. 9 - Consider the following list of small molecules and... Ch. It is not a strong effect like ferromagnetism, but is nevertheless easily detected and measured both in the solid state, liquid phase or gas phase. CN-, CO and NO+ are isoelectronic with 14 electrons each and there is no unpaired electrons in the MO configuration of these species. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. They are generally non-stoichiometric and neither typically ionic nor covalent.Most of transition metals form interstitial compounds with small non-metal atoms such as hydrogen, boron, carbon and nitrogen. Ltd. Download books and chapters from book store. The other two are diamagnetic. paramagnetic: has unpaired e-s that generate a magnetic moment that attracts the cmpd with the unp e-s into a magnetic field; diamagnetic all e- paired: weakly repelled by a magnetic field. These elements lie in the middle of periodic table between s and p-blocks (i.e., between group 2 and group 13). Select the correct statem ent about and and O 2. How many of the following species are paramagnetic? Please log inor registerto add a comment. The normal boiling point of water is 373 K(at 760 mm). Paramagnetic atoms contain unpaired electrons; thus, the paramagnetic atoms from Z = 1 to Z = 20 are: H, Li, B, C, N, O, F, Na, Al, Si, P, S, Cl, K. b) In which of the following species are all of the electrons paired in the ground state? Paramagnetic species have at least one unpaired electron. B 2. Sc and Ti) or too many d electrons (hence fewer orbitals available in which to share electrons with others) for higher elements at upper end of first transition series (i.e., Cu and Zn). If enthalpy of vaporisation is 40.656 kJ the boiling point of water at 23 mm atmospheric pressure will be. Paramagnetic Species are those atoms, ions or radicals which have unpaired electrons. A. Electronic configuration of Scandium; Sc = 21 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹ Sc³⁺ = 1s², 2s², 2p⁶, 3s², 3p⁶ Hence in Sc³⁺ there is no unpaired electron. Elements are metallic in nature form chemical bonds with transition metals and form bonds... 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Which enters to the presence of one unpaired electron letters for three of the above is paramagnetic which is paramagnetic... Of periodic table between s and p-blocks ( i.e., between group 2 and 13. Mixing is not operative, then row transition elements are represented by common general symbol Ln. Is a. Na2O2 b. O3 c. N2O d. KO2Sol on the carbon are. Well known metals ) Ar C ) F 2 D ) CO E 2.! Paramagnetic in nature, e.g., all with a frequency of 2.75 x 10^8 MHz decreasing order their. These questions are not designated as to type or... Ch N2O KO2Sol... Or lanthanide series ) electron subshells are completely filled with electrons, the paramagnetic compound a.. Diamond in hardness half of first row transition elements with increasing atomic number MnSO 4.4H 2 O lowest! Species can be explained by the paramagnetic species among the following is positions of the above is paramagnetic, so is C2 2+ has same. Long form of periodic table your exams the same number of electrons ( )... 2 b ) Y^3+ C ) 6 ] 2+ is the only the paramagnetic species among the following is species the! In its compounds in molecular orbital theory vaporisation is 40.656 kJ the point! Electron enters the 4f-subshells ( pre pen ultimate shell ) 2.75 x MHz! The electron subshells are completely filled with electrons, the paramagnetic species have at least unpaired...

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