Assertion : [Fe(H_2 O)_5 NO] SO_4 is paramagnetic. Reason : The Fe...

Assertion :

\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right] \mathrm{SO}_4

is paramagnetic.Reason : The Fe in \left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right] \mathrm{NO}_4 has three unpaired electrons. Assertion : [Fe(H_2 O)_5 NO] SO_4 is paramagnetic. Reason : The Fe in [Fe(H_2 O)_5 NO] NO_4 has three unpaired

Assertion : [Fe(H_2 O)_5 NO] SO_4 is paramagnetic. Reason : The Fe in [Fe(H_2 O)_5 NO] NO_4 has three unpaired

Options

AIf both assertion and reason are true and reason is the correct explanation of assertion
BIf both assertion and reason are true but reason is not the correct explanation of assertion
CIf assertion is true but reason is false
DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

(a) :

\mathrm{Fe}^{+}:[\mathrm{Ar}] 3 d^6 4 s^1

When the weak field ligand

\mathrm{H}_2 \mathrm{O}

and strong field ligand NO attack, the configuration changes as follows:

\mathrm{Fe}^{+}:[\mathrm{Ar}] 3 d^7 4 s^0

\therefore \quad \mathrm{Fe}^{+}

has 3 unpaired electrons.

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