MCQ
The complex ion which has no $'d'$ electrons in the central metal atom is :
- A$[Co(NH_3)_6]^{3+}$
- B$[Fe(CN)_6]^{3-}$
- ✓$[Cr(H_2O)_6]^{3+}$
- D$[MnO_4]^-$
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$(I)$ $B + ANO_3 \to B NO_3 + A$
$(II)$ $A + HCl \to ACl + \frac{1}{2}{H_2}$
$(III)$ $D + ECl \to DCl + E$
$(IV)$ $D + HNO_3 \to H_2$ gas is not evolved
$(A)$ Pentane
$(B)\,2-$ Methyl butane
$(C)\,2,2-$ Dimethyl propane