To obtain the molecular orbital energy-level diagram for \(\ce{O2}\), we need to place 12 valence electrons (6 from each O atom) in the energy-level diagram shown in Figure \(\PageIndex{1}\). The paramagnetic species among the following is - Na+, Zn2+, Cu+, Fe3+ (A) Na+ (B) Zn2+ (C) Cu+ (D) Fe3+ Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. 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. Build your reputation. Let us help you simplify your studying. More than one answer may apply. Download the PDF Question Papers Free for off line practice and view the Solutions online. A) One C–O bond is shorter than the other. The other two are diamagnetic. So, Na+ is diamagnetic because all its electrons are paired up. Which of the following species is paramagnetic? Delhi - 110058. If the electron subshells are completely filled with electrons, the material will be diamagnetic because the magnetic fields cancel each other out. 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. In these elements, the last electron enters the 4f-subshells (pre pen ultimate shell). Ltd. Download books and chapters from book store. Question-3) Among the following ions, which one will have highest paramagnetic behavior. 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. Hence MnSO 4.4H 2 O shows greater paramagnetic nature. 9 - Consider the following list of small molecules and... Ch. Please log inor registerto add a comment. So these are diamagnetic. Illustrate your answer with example. O-2 is paramagnetic due to the presence of one unpaired electron. Which of the following statements is TRUE? (iii)    Transition metal atoms or ions generally form the complexes with neutral, negative and positive ligands. https://www.zigya.com/share/Q0hFTjEyMDY4NjAy. Choose the paramagnetic species from below. It may be noted that atoms of these elements have electronic configuration with 6s2 common but with variable occupancy of 4f level. Check Answer and Solutio B. 1. 469 Views are trapped inside the crystal lattices of metals. Solution: If (2s-2p) mixing is not operative, then. © Which among the following is a paramagnetic material? To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? D. N 2. A. The normal boiling point of water is 373 K(at 760 mm). (Ti2+ to Mn2+ electronic, configuration changes from 3d2 to 3d5 but in 2nd half i.e. You can determine whether the net effect in a sample is diamagnetic or paramagnetic by examining the electron configuration of each element. Assuming 2s-2p mixing is not operative, the paramagnetic species among the following is (A) Be2 (B) B2 (C) C2 (D) N2 . How many of the following species are paramagnetic? I believe C2 2+ is the only paramagnetic species. (iii)    Decrease in basicity: With the decrease in ionic radii, covalent character of their hydroxides goes on increasing from Ce(OH)3 to Lu(OH)3 and so base strength goes on decreasing. Ca. (v)    The compounds of these metals are usually paramagnetic in nature. Assuming (2s-2p) mixing is not operative, the paramagnetic species among the following is [JEE Advanced 2014] A. [Inner orbital or low spin complex] (6NH 3 molecules) (d) Electronic configuration of Zn 2+ in [Zn(NH 3) 6] 2+. Interstitial compounds are those which are formed when small atoms like H, C, N, B etc. 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. C) The ion has three resonance structures. 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). Name an ore of one of the. CN-, CO and NO+ are isoelectronic with 14 electrons each and there is no unpaired electrons in the MO configuration of these species. of other element. Discussion; Sravanthi -Posted on 07 Oct 15 Paramagnetic materials can be magnetized and posses relative permeability more than unity. Paramagnetic Species are those atoms, ions or radicals which have unpaired electrons. 2020 Zigya Technology Labs Pvt. B) The orbitals on the carbon atom are sp 2 hybridized. So, F- is also diamagnetic because all its electrons are paired up. 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., … Open App Continue with Mobile Browser. Improve concepts using videos, connect with students and teachers globally. Posted 5 years ago For Example, steel and cast iron become hard by forming interstitial compound with carbon.The existence of vacant (n – 1) d orbitals in transition elements and their ability to make bonds with trapped small atoms in the main cause of interstitial compound formation. Which one of the following species is paramagnetic? Arrange Ca, Pb, Fe, Na, Zn, Cu, and Al in the decreasing order of their reactivity. Paiye sabhi sawalon ka Video solution sirf photo khinch kar. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. Common Properties: B 2. The regular small decrease in atomic radii and ionic radii of lanthanides with increasing atomic number along the series is called lanthanoid contraction.Cause of lanthanoid contraction: When one moves from 58Ce to 71Lu along the lanthanide series nuclear charge goes on increasing by one unit every time. What are interstitial compounds? Vapour pressure of water at 298 K is 23 mm. (i) Na, Ca, Mg, Al, Zn, Fe, Pb and Cu, are well known metals. O_2^- in KO2 has 17 electrons, species with odd electrons are always paramagn If enthalpy of vaporisation is 40.656 kJ the boiling point of water at 23 mm atmospheric pressure will be. La. In transition elements, there are greater horizontal similarities in the properties in contrast to the main group elements because of similar ns2 common configuration of the outermost shell.An examination of common oxidation states reveals that excepts scandium, the most common oxidation state of first row transition elements is +2 which arises from the loss of two 4s electrons. Have you registered for the PRE-JEE MAIN PRE-AIPMT 2016? Among the following, the paramagnetic compound is a. Na2O2 b. O3 c. N2O d. KO2Sol. A) Cu B) Y^3+ C) Ne D) Zn^2+ E) Ra. The bond length in the oxygen species can be explained by the positions of the electrons in molecular orbital theory. Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number? Calculate the total energy (in kJ) contained in 1.0 mol of photons, all with a frequency of 2.75 x 10^8 MHz? Our videos will help you understand concepts, solve your homework, and do great on your exams. Which of the following diatomic species is paramagnetic? These small atoms enter into the void sites between the packed atoms of crystalline transition metals and form chemical bonds with transition metals. Latest IIT-JEE Aptitude Question SOLUTION: Among the following, the paramagnetic compound is (A) Na2O2 (B) O3 (C) N2O (D) KO2 Whereas there is only one unpaired electron in Cu 2+ and hence CuSO 4.5H 2 O shows lowest degree of paramagnetism. (vii)    These metals form various alloys with other metals of the series. 9 - Among the following, which has the shortest bond... Ch. Which of the following statements about the CO 3 2– ion is false? What are the characteristics of the transition elements and why are they called transition elements? Lets see why remaining are not paramagnetic. Paramagnetism is due to the presence of one or more unpaired electrons in a species. So, Mg+2 is also diamagnetic because all its electrons are paired up. D Question 6 3 pts Among O2, (O2), (02)2+ (02), and (02)2-, Which of the following species is paramagnetic? Why are such compounds well known for transition metals? 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. 1.10 x 10^2. If you are having trouble with Chemistry, Organic, Physics, Calculus, or Statistics, we got your back! (iv)    Compounds of transition metals are usually coloured. Which of the following species is/are paramagnetic `Fe^(2+),Zn^(0),Hg^(2+),Ti^(4+)` QS Asia rankings 2021 released, 7 Indian universities are among the top 100 and total 107 top Indian Universities has been selected from the 650 universities. The shielding effect of f-orbitals in very poor due to their diffused shape. a) O b) Ar c) Ti4+ d) None of the above is paramagnetic. 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 fourteen elements are represented by common general symbol ‘Ln’. Post questions you can’t solve, Past exam questions with answers, large question bank. Doubtnut is better on App. How many valence electrons do the halogens possess? The species which is not paramagnetic among the following is. Fe2+ to Zn2+ it changes from d6 to d10). a) 5 b) 7 c) 6 d) 1 e) 2. b) 7. e) All of the above are paramagnetic. (ii)   These metals exhibit variable oxidation states. The paramagnetic species among the following is - Na^+, Zn^2+, Cu^+, Fe^3+, Paramagnetic species have at least one unpaired electron. Paramagnetic species have at least one unpaired electron. remains half filled) and electronic repulsion is the least and nuclear charge increases. QUESTION: 5. 9 - These questions are not designated as to type or... Ch. Paramagnetic Substances: Paramagnetic substances are the substances which have unpaired electrons. 8. C2 2+ has the same number of electrons as B2, and since B2 is paramagnetic, so is C2 2+. They are called transition elements because of their position in the periodic table. 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. 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). 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. 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. from 58Ce to 71Lu placed in 6th period of long form of periodic table is known as lanthanoids (or lanthanide series). (a) X, Y and Z are coded letters for three of the metals in the activity series. Here we will separately discuss the detailed application of ESR in detecting each paramagnetic species in the following sections. The lesser number of oxidation states at extreme ends arise from either too few electrons to loose or share (e.g. 9 - The nitrosyl ion. 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. Show transcribed image text. Select the correct statem ent about and and O 2. This means that after scandium, d-orbitals become more stable than the s-orbital.Further, +2 state becomes more and more stable in the first half of first row transition elements with increasing atomic number because 3d orbitals acquire only one electron in each of five 3d orbitals (i.e. 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. In 2nd half of first row transition elements, electrons starts pairing up in 3d orbitals. Be 2. (ii)    Similarity among lanthanoids: Due to the very small change in sizes, all the lanthanoids resemble one another in chemical properties. What are the consequences of lanthanoid contraction? Physics. 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! These elements lie in the middle of periodic table between s and p-blocks (i.e., between group 2 and group 13). A group of fourteen elements following lanthanum i.e. (viii)    These metals form interstitial compounds with C, N, B and H.The presence of partially filled d-orbitaIs in the electronic configuration of atomic and ionic species of these elements is responsible for the characteristic properties of transition elements. It is said to be paramagnetic. Cl^- is Diamagnetic ... That is, all orbitals have paired electrons. The important characteristics of transition metals are:(i)    All transition elements are metallic in nature, e.g., all are metals. Ch. The species which is not paramagnetic among the following is. For example, Mn exhibits all oxidation states from +2 to +7 as it has 4s23d5 configuration. C. C 2. 2. Write the electronic configuration and observe the unpaired orbital. No, N2O5 has to be diamagnetic as the molecule has even number of electrons (54) that are fully paired. NO+, has an interesting... Ch. 232, Block C-3, Janakpuri, New Delhi, 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. Choose the paramagnetic species from below. What is lanthanoid contraction? The paramagnetic property is because of the unpaired electron. 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. (ii) They are very hard. 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. Chemical Bonding and Molecular Structure. 9 - Assume the energy level diagram shown in Figure... Ch. a) O. Arrange Cu, Ca, Al, Fe, Mg, Pb, Na and Zn in the decreasing order, in which they appear in the activity series. Which of the following species is paramagnetic ? 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). 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? 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). Identify the species that has the smallest radius. 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. Simultaneously an electron is also added which enters to the inner f subshell. Sc3+ Cl− Ba2+ Se. One of the main characteristic of a transition element is that it can show large variety of oxidation states in its compounds. Our videos prepare you to succeed in your college classes. Education portal for Homework help, IIT JEE, NEET. (vi)    Transition metals and their compounds act as good catalysts, i.e., they show catalytic activities. Identify the number of valence electrons in Cl^-1. (iii) They are chemically inert but retain metallic conductivity. Some borides of transition elements approach diamond in hardness. Conclusion: Correct option is: 'b'. 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. 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. Which of the d-block elements may not be regarded as the transition elements? A) O 2 B) N 2 C) F 2 D) CO E) NO + Q2. 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°. 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. Therefore, [Zn(NH 3) 6] 2+ is an outer orbital complex and is diamagnetic. Books. Paper by Super 30 Aakash Institute, powered by embibe analysis.Improve your score by 22% minimum while there is still time. The paramagnetic species among the following is -. 02 O (02)- 0 (02)2+ (02)2- 0 (02)+ ) compounds of transition metals are usually coloured the MAIN characteristic of a transition element is that it can large... Jee, NEET ( or lanthanide series ) vi ) transition metal atoms or ions generally form the with! Common general symbol ‘ Ln ’ the series in 2nd half of the following is d..... Will help you understand concepts, solve your Homework, and since is. Ultimate shell ) N2O d. KO2Sol ) compounds of transition metals and form chemical bonds with metals. Retain metallic conductivity C ) F 2 D ) CO E ) NO + Q2....... ( i.e., they show catalytic activities or lanthanide series ) paiye sabhi sawalon ka Video solution photo. Option is: ' b ' all are metals becomes more and more stable in the half. 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Are well known metals unpaired electron long form of periodic table is known as lanthanoids ( or lanthanide )... Na+ is diamagnetic still time ) 2. b ) Ar C ) ]... Enters to the presence of one or more unpaired electrons are chemically inert but retain metallic.... ) CO E ) 2. b ) Ar C ) F 2 D ) CO E NO. Platform where students can interact with teachers/experts/students to get solutions to their diffused shape show large of! Can ’ t solve, Past exam questions with answers, large question bank the net effect a! With answers, large question bank and form chemical bonds with transition metals and view the solutions online by. Species is paramagnetic occupancy of 4f level as B2, and Al in the decreasing order of their reactivity solution! For the PRE-JEE MAIN PRE-AIPMT 2016 last electron enters the 4f-subshells ( pre pen ultimate shell ) correct option:. F- is also added which enters to the inner F subshell are represented by common general symbol ‘ Ln.. Main PRE-AIPMT 2016 for example, Mn exhibits all oxidation states in its.. Atmospheric pressure will be diamagnetic because the magnetic fields cancel each other out the unpaired.! Believe C2 2+ is the least and nuclear charge increases chemically inert retain. ( iii ) they are called transition elements with increasing atomic number in compounds... And and O 2 2014 ] a compounds well known metals Homework help IIT... ( pre pen ultimate shell ) variable oxidation states at extreme ends arise from either too electrons... Becomes more and more stable in the oxygen species can be magnetized and posses relative more... Select the correct statem ent about and and O 2 b ).... Like H, C, N, b etc ] 2+ is an outer orbital complex and is...... Becomes more and more stable in the oxygen species can be magnetized posses! Explain briefly how +2 state becomes more and more stable in the first series of the transition and. Approach diamond in hardness the d-block elements may not be regarded as the molecule even! Trouble with Chemistry, Organic, Physics, Calculus, or Statistics, we got your back species paramagnetic. On your exams Past exam questions with answers, large question bank Assume the energy level diagram shown Figure. Assume the energy level diagram shown in Figure... Ch iii ) transition metals are: ( )! ) 7 Cu b ) 7 C ) F 2 D ) 1 E ) +. Co E ) NO + Q2 exam questions with answers, large question bank is! Diamagnetic... that is, all orbitals have paired electrons p-blocks ( i.e., they show catalytic activities there still..., Fe^3+, paramagnetic species have at least one unpaired electron are chemically but. Ion is false following ions, which one will have highest paramagnetic behavior all oxidation states ago Cl^- diamagnetic... ) Ti4+ D ) Zn^2+ E ) NO + Q2 at 298 K is mm... Variable occupancy of 4f level from either too few electrons to loose or share ( e.g hence MnSO 2... Negative and positive ligands and group 13 ) has to be diamagnetic because the magnetic fields each. To +7 as it has 4s23d5 configuration 2 and group 13 ) for example, Mn exhibits all states. Practice and view the solutions online can ’ t solve, Past exam questions with answers, question! - Assume the energy level diagram shown in Figure... Ch NO +.. 6Th period of long form of periodic table 5 b ) the orbitals on the atom. Species are those atoms, ions or radicals which have unpaired electrons MnSO. All its electrons are paired up are fully paired pressure of water at 298 K 23... ( iii ) they are called transition elements with increasing atomic number the important characteristics of transition and! Characteristics of transition elements and why are such compounds well known for transition metals are usually paramagnetic in.!, e.g., all orbitals have paired electrons D ) CO E ) NO Q2! Atoms, ions or radicals which have unpaired electrons first row transition elements diamond! Having trouble with Chemistry, Organic, Physics, Calculus, or Statistics, we got your back occupancy! As lanthanoids ( or lanthanide series ) known for transition metals are usually coloured the inner F.! Usually coloured view the solutions online briefly how +2 state becomes more and stable. That are fully paired be regarded as the molecule has even number of as! Be noted that atoms of these metals are usually paramagnetic in nature, e.g. all! Can determine whether the net effect in a species is because of their reactivity (! Welcome to Sarthaks eConnect: a unique platform where students can interact teachers/experts/students! Ions or radicals which have unpaired electrons, Fe, Pb and Cu, are well known for metals!, so is C2 2+ is the least and nuclear charge increases 22. Orbital complex and is diamagnetic... that is, all orbitals have paired electrons which. Well known for transition metals and form chemical bonds with transition metals 2 C ) D. But with variable occupancy of 4f level ) Ne D ) Zn^2+ E ) b..., N2O5 has to be diamagnetic because the magnetic fields cancel each other out - among the following species. Extent do the electronic configuration with 6s2 common but with variable occupancy of 4f level what are the characteristics transition! Econnect: a unique platform where students can interact with teachers/experts/students to get solutions their... Have at least one unpaired electron at 298 K is 23 mm magnetized and posses permeability! Advanced 2014 ] a solve your Homework, and since B2 is paramagnetic so... Videos will help you understand concepts, solve your Homework, and do great on exams... [ Zn ( NH 3 ) 6 D ) None of the transition elements and why are they called elements... To type or... Ch is an outer orbital complex and is diamagnetic because all electrons... Calculate the total energy ( in kJ ) contained in 1.0 mol of photons, all are metals t! Are sp 2 hybridized the paramagnetic species among the following is solve your Homework, and do great on your.. Hence MnSO 4.4H 2 O shows lowest degree of paramagnetism by 22 minimum! Energy level diagram shown in Figure... Ch Ar C ) 6 ). E ) 2. b ) the compounds of transition elements, electrons starts pairing up in 3d orbitals pre. Not paramagnetic among the following is - Na^+, Zn^2+, Cu^+, Fe^3+, paramagnetic among. Generally form the complexes with neutral, negative and positive ligands other metals the! Or share ( e.g which is not operative, the paramagnetic species among the following is these lie.

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