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Assertion[Fe(H(2)O)(5)NO]SO(4) is parama...

Assertion`[Fe(H_(2)O)_(5)NO]SO_(4)` is paramagnetic
Reason The Fe in `[Fe(H_(2)O)_(5)NO]SO_(4)` has three unpaired electrons .

Text Solution

Verified by Experts

The correct Answer is:
a
`[Fe(H_(2)O)_(5)NO]SO_(4)`
`NO` has charge equal to `+1` in this complex Therefore, the oxidation number of Fe in the complex becomes `+1`
`Fe = 3d^(6) 4s^(2),Fe^(o+) =3d^(6) 4s^(1)`
Since `H_(2)O` is a weak filed ligand and `No^(o+)` is a strong field ligand so olny `NO^(o+)` cause pairing of `4s` electron Thus only one pairing occurs
Thus the configuration is `3d^(7)` and the complex of unpaired electrons is 3
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(a). Assertion (A) is true, Reason (R) is also true, Reason (R) is the correct explanation for assertion (A). (b). Assertion (A) is true, Reason (R) is true, Reason (R) is not the correct explanation for Assertion (A). (c). Assertion (A) is true, Reason (R) is false. (d). Assertion (A) is false, Reason (R) is true. Q. Assertion (A): [Fe(H_2O)_5NO]SO_4 paramagnetic. Reason (R): The Fe in [Fe(H_2O)_5NO]SO_4 has three unpaired electrons.

Assertion : O_(2) is paramagnetic. Reason : It has one unpaired electron.

Knowledge Check

  • Assertion : [Fe(H_(2)O)_(6)]^(2+) is sp^(3) d^(2) hybridised and paramagnetic complex ion . Reason : [Fe(H_(2)O)_(6)]^(2+) has four unpaired electrons as H_(2)O is a weak field ligand .

    A
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    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    if both assertion and reason are false

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