MCQ
Which of the following complex is diamagnetic and tetrahedral
- A$\left[ {Ni{{\left( {CO} \right)}_4}} \right]$
- B${\left[ {Hg{I_4}} \right]^{2 - }}$
- C${\left[ {Fe{{\left( {CO} \right)}_4}} \right]^{2 - }}$
- ✓All of these
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$\Lambda _{C{H_3}COONa}^o =91.0\, S \,cm^2 /equiv.$
$\Lambda _{HCl}^o =426.2 \,S \,cm^2 /equiv.$
What additional information$/$quantity one needs to calculate ${\Lambda ^o}$ of an aqueous solution of acetic acid ?

Assertion $A$ : Aniline on nitration yields ortho, meta and para nitro derivatives of aniline.
Reason $R$: Nitrating mixture is a strong acidic mixture.
In the light of the above statements, choose the correct answer from the options given below