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Identify a 3d metal from a periodic property, then find the spin-only magnetic moment of its ion

This type of question, asked 4 times: 8 Apr 2024, 9 Apr 2024, 2 Apr 2025, 3 Apr 2025. All 4 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    8 Apr 2024

    55
    The 'spin only' magnetic moment value of MO42−MO_{4}^{2-} is _____ BM. (Where MM is a metal having least metallic radii among ScSc, TiTi, VV, CrCr, MnMn and ZnZn). (Given atomic number: Sc=21Sc = 21, Ti=22Ti = 22, V=23V = 23, Cr=24Cr = 24, Mn=25Mn = 25 and Zn=30Zn = 30)

  2. Question 2

    9 Apr 2024

    142
    A transition metal 'M' among Sc, Ti, V, Cr, Mn and FeFe has the highest second ionisation enthalpy. The spin only magnetic moment value of M+M^{+}ion is ____ BM (Near integer) (Given atomic number Sc:21,Ti:22, V:23,CrSc:21,Ti:22,\text{ }V:23,Cr : 24, Mn:25,Fe:26)Mn:25,Fe:26)

  3. Question 3

    2 Apr 2025

    125
    The spin-only magnetic moment value of Mn+M^{n +} ion formed by the metal among Ni,Zn,MnNi, Zn, Mn and Cu that has the least enthalpy of atomisation is ____ . (in nearest integer) Here n is equal to the number of diamagnetic complexes among K2[NiCl4]K_{2}\left\lbrack {NiCl}_{4} \right\rbrack, [Zn(H2O)6]Cl2\left\lbrack Zn\left( H_{2}O \right)_{6} \right\rbrack{Cl}_{2}, K3[Mn(CN)6]K_{3}\left\lbrack Mn(CN)_{6} \right\rbrack and [Cu(PPh3)3I]\left\lbrack Cu\left( {PPh}_{3} \right)_{3}I \right\rbrack

  4. Question 4

    3 Apr 2025

    124
    Among, Sc,Mn,CoSc,Mn,Co and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is ____ BM (in nearest integer).