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Magnetic Properties and Character - (Concept)
When a magnetic field is applied to substances, mainly two types of magnetic behaviour are observed: diamagnetism and paramagnetism. Diamagnetic substances are repelled by the applied field while the paramagnetic substances are attracted. Substances which are attracted very strongly are said to be ferromagnetic. In fact, ferromagnetism is an extreme form of paramagnetism. Many of the transition metal ions are paramagnetic.
Paramagnetism arises from the presence of unpaired electrons, each such electron having a magnetic moment associated with its spin angular momentum and orbital angular momentum. For the compounds of the first series of transition metals, the contribution of the orbital angular momentum is effectively quenched and hence is of no significance. For these, the magnetic moment is determined by the number of unpaired electrons and is calculated by using the ‘spin-only’ formula, i.e.,
where n is the number of unpaired electrons and μ is the magnetic moment in units of Bohr magneton (BM). A single unpaired electron has a magnetic moment of 1.73 Bohr magnetons (BM).
The magnetic moment increases with the increasing number of unpaired electrons. Thus, the observed magnetic moment gives a useful indication about the number of unpaired electrons present in the atom, molecule or ion.
| Exam | Chapter |
| JEE MAIN | d - and f - BLOCK ELEMENTS |
The INCORRECT statement is :
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Which of the following ions has the maximum magnetic moment?
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The correct order of magnetic moments (spin only values in B.M.) among is
(Atomic nos.: Mn = 25, Fe = 26, Co = 27)
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The “spin-only” magnetic moment [ in units of Bohr magneton, ] of
in aqueous solution would be (atomic number of Ni = 28)
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What is the spin - only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in its aqueous solution?
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In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is _________ BM. (Round off to the Nearest Integer).
[Given: ]
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The oxide that shows magnetic property is:
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The correct electronic configuration and spin-only magnetic moment (BM) of respectively, are :
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The metal ion ( in gaseous state) with lowest spin-only magnetic moment value is
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The spin-only magnetic moment value of the most basic oxide of vanadium among is_____________ B.M. (Nearest integer)
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The number of statement(s) correct from the following for Copper (at. no. 29) is/are____________.
(A) complexes are always paramagnetic
(B) complexes are generally colourless
(C) is easily oxidized
(D) In Fehling solution, the active reagent has
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Among ions, one if used as a reagent cannot liberate
from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is____________ B.M. (Nearest integer)
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The spin-only magnetic moment value of the compound with strongest oxidizing ability among and
is __________. B.M. [nearest integer]
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The spin only magnetic moments (in BM) for free and
ions respectively are
(At.No. Sc : 21, Ti : 22, V : 23)
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The spin only magnetic moment of the complex present in Fehling's reagent is_____________ B.M. (Nearest integer).
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The complex, has
electronic configuration and one unpaired electron, which of the following statements is true?
1 ) The complex is octahedral
2) It is an outer sphere complex
3) It is diamagnetic
4) The coordination number of this compound is 6
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Which of the following is paramagnetic?
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The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is
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How many of the following metal ions have similar value of spin only magnetic moment in gaseous state?
(Given: Atomic number:)
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For a metal ion, the calculated magnetic moment is 4.90BM. This metal ion has___________ number of unpaired electrons.
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Calomel is repelled by weak magnetic field because:
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How many metals in the following group have same magnetic moment?
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Which of the following electronic configuration would be associated with the highest magnetic moment?
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Diamagnetic Lanthanoid ions are :
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When a magnetic field is applied to substances, mainly two types of magnetic behaviour are observed: diamagnetism and paramagnetism (Unit 1).
