MCQ
The crystal structure of pure silicon is like:
- ✓Diamond
- BGraphite
- CSilver
- DZinc
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Which of the following cation does not respond to the above reaction ?

$(I)\,\,[Fe(CN)_6]^{4-}$ $(II)\,\,[Fe(CN)_6]^{3-}$
$(III) [Cr(NH_3)_6]^{3+}$ $(IV)\,\,[Ni(H_2O)_4]^{2+}$

Choose the correct statement($s$).
$(A)$ The order of basicity is $II > I > III > IV$ .
$(B)$ The magnitude of $p K_{ b }$ difference between $I$ and $II$ is more than that between $III$ and $IV$.
$(C)$ Resonance effect is more in $III$ than in $IV$.
$(D)$ Steric effect makes compound $IV$ more basic than $III$.