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The enthalpy of hydration of the Fe^(2+)...

The enthalpy of hydration of the` Fe^(2+)` ion is `11.4kcal//mol` higher than would be expected if there were no crystal field stabillisation energey Assuming the equo complex to be high spin estimate the magnitude of `Delta_(0)` for `[Fe(H_(2)O)_(6)]^(2+)` ion .

Text Solution

Verified by Experts

`Fe^(2+)` is `t_(2g) ^(4) e_(g)^(2)` in weak field environment
`CFSE = - ( 0.4 xx 4) Delta_(0) + (0.6) xx 2)Delta_(0)`
`=- 1.6 Delta_(0) + 1.2 Delta_(0)` ltbgt ` = - 0.4 Delta_(0)`
`DeltaH_(hyd)` is higher because the energey of the complex lowered b`y -11.4kcal//mol`
`CFSE = - 11.41 kcal//mol = - 0.4Delta_(0)`
`Delta_(0) = (-11. 4)/(0.4) = - 28 .5 kcal//mol`
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Write coordination number of Fe^(+3) in [Fe(C_(2)O_(4))_(3)]^(3−) complex ion.

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Knowledge Check

  • In the complex ion [Fe(H_(2)O)_(5)NO]^(2+)

    A
    Fe is in the `=2` oxidation state and NO coordinates as `NO^(+)`
    B
    Fe is in the `+3` oxidation state and NO coordinates as `NO^(-)`
    C
    Fe is in the `+2` oxidation state and NO coordinates as neutral NO (nitrosyl) radical
    D
    Fe is in the `+1` oxidation state and NO coordinates as `NO^(+)` (nitrosonium ion)

  • The hybridisation and unpaired electrons in [Fe(H_(2)O)_(6)^(2+)] ion are :

    A
    `sp^(3)d^(2)`,4
    B
    `d^(2)sp^(3),3`
    C
    `d^(2)sp^(3)`,4
    D
    `sp^(3)d^(2),2`

  • Crystal field splitting energey (CFSE) for the complex [Fe(O)_(4)]^(2-) is when Delta =125 and P =250kJmo1^(-1) .

    A
    `-1.2Delta_(t)`
    B
    `1.2Delta_(t)`
    C
    `-8`
    D
    8

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