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A d-block element forms octahedral compl...

A d-block element forms octahedral complex but its spin magnetic moment remains same either in strong field or in weak field ligand Which pf the following is//are correct ?

A

a.Element always forms colourless comound

B

b.Number of electrons in `t_(2g)` orbitals are higher than in `e_(g)` orbitals

C

c.It can have either `d^(3)` or `d^(8)` configuration.

D

d.It can have either `d^(7)` or `d^(8)` configuration

Text Solution

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The correct Answer is:
B, C
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Spin only magnetic moment of an octahedral complex of Fe^(2+) in the presence of a strong field ligand in BM is:

Velence bond theroy describes the bonding in complexs in terms of coordinate -covalent bond resulting from overlap filled ligand orbitals with vacant metal hybrid orbitals This theory explains magnetic behaviour and geometrical shape of coordination compounds Magnetic moment of a complex compound can be determined experimentally and theoretically by using spin only formula Magnetic moment sqrtn (n+2)BM (where n = No. unpaired electrons) . The value of of spin only magnetic moment for octahedral complex of the following configuration is 2.84BM The correct statement is (a) d^(4) (in weak field ligand) (b) d^(2) (in weak field and in strong field ligand) (c) d^(3) (in weak field and in strong field ligand) (d) d^(5) (in strong field ligand) .

Knowledge Check

  • A d-block element forms octahedral complex but its magnetic moment remains same either in strong field or in weak field ligand. Which of the following is/are correct?

    A
    Element always forms colourless compound
    B
    Number of electron in `t_(2g)` orbitals are higher than in `e_(g)` orbitals
    C
    It can have either `d^(3) or d^(8)` configuration
    D
    It can have either `d^(7) or d^(8)` configuration

  • In weak field ligand, which one of the following cations has maximum magnetic moment?

    A
    `Fe^(2+)`
    B
    `Cu^(2+)`
    C
    `Ni^(2+)`
    D
    `Co^(2+)`

  • Wilkinson's catalyst react with H_(2) to form an octahedral complex in which Rh(Z=45) has the following electronic configuration in the ligand field, t_(2g)^(2,2,2),e_(g)^(0,0) Then which of the following is correct about this new complex ?

    A
    It is diamagnetic
    B
    Its IUPAC name is chloridotris(triphenylphosphine)rhodium(I)
    C
    Hybridization of Rh(I) is `sp^(3)d^(2)`
    D
    It is a paramagnetic complex

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