MCQ
Which of the following is spin-free complex?
- ✓$[Fe(H_2O)_6] Cl_2$
- B$K_4[Fe(CN)_6$
- C$[Ni(CO)_4]$
- D$[Ni(CN)_4]^{2-}$

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$\overset{\left( II \right)}{\mathop{\left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]}}\,$ $\overset{\left( II \right)}{\mathop{\left[ PtC{{l}_{4}} \right]}}\,$

$(A)$ $\Lambda \stackrel{0}{ m }$ for electrolyte $A$ is obtained by extrapolation
$(B)$ For electrolyte B, vx $\Lambda m$ vs $\sqrt{ c }$ graph is a straight line with intercept equal to $\Lambda \stackrel{0}{ m }$
$(C)$ At infinite dilution, the value of degree of dissociation approach zero for electrolyte $B$.
$(D)$ $\Lambda \stackrel{0}{ m }$ for any electrolyte $A$ or $B$ can be calculated using $\lambda^{\circ}$ for individual ions.