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Which of the following complexes exhibit...

Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly=glycine, en=ethylenediamine and bipy =bipyridyl
(At. no. `Ti=22, V=23, Fe=26, Co=27`)

A

`[V(gly)_(2)(OH)_(2)(NH_(3))_(2)]^(+)`

B

`[Fe(en)(bpy)(NH_(3))_(2)]^(2+)`

C

`[Co(OX)_(2)(OH)_(2)]^(2-)`

D

`[Ti(NH_(3))_(6)]^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
C
Ox. State of V in (a) :
x+2(-1)+2(-1)+0=+1 or x=+5
`therefore` Valence shell config. = `3d^(0)` (i.e., no unpaired electron)
Ox state of Fe in (b) : x+0+0+0=+2
or x = + 2
`therefore` Valence shell config. = `3d^(6)` (i.e., 4 unpaired electrons)
Ox. state of Co in (c ) : x+2(-2)+2(-1)=-2
or x=+4
`therefore` Valence shell config. `=3d^(5)` (i.e., 5 unpaired electrons)
Ox state of Ti in (d) : x+6(0)=+3 or x=+3
`therefore` Valence shell config. = `3d^(1)` (i.e., 1 unpaired electron)
Thus, complex of cobalt has maximum unpaired electrons (viz. 5) and hence has highest paramagnetism.
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Knowledge Check

  • Which one of the following amino complexes would show the highest value of paramagnetic behaviour ?

    A
    `[Cr(NH_(3))_(6)]^(3+)`
    B
    `[Co(NH_(3))_(6)]^(3+)`
    C
    `[Zn(NH_(3))_(6)]^(3+)`
    D
    `[Ni(NH_(3))_(6)]^(2+)`

  • Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

    A
    `[Ni(NH_(3))_(6)]^(2+)`
    B
    `[Zn(NH_(3))_(6)]^(2+)`
    C
    `[Cr(NH_(3))_(6)]^(3+)`
    D
    `[Co(NH_(3))_(6)]^(3+)`

  • Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour ?

    A
    `[Ni(NH_3)_6]^(2+)`
    B
    `[Zn(NH_3)_6)]^(2+)`
    C
    `[Cr(NH_3)_6]^(3+)`
    D
    `[Co(NH_3)_6]^(3+)`

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    Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour ? (At. Nos : Cr = 24, Mn = 25, Fe = 26, Co = 27)

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