A) \[S{{c}^{3+}}>C{{r}^{3+}}>F{{e}^{3+}}>M{{n}^{3+}}\] ? ionic radii
B) \[Sc<Ti<Cr<Mn\] ? density
C) \[M{{n}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}}<F{{e}^{2+}}\] ? ionic radii
D) \[FeO<CaO<MnO<CuO\] ? basic nature
Correct Answer: A
Solution :
\[=R\left( \frac{1}{4}-\frac{1}{9} \right)\] the correct order is \[\frac{1}{\lambda }=R\left( \frac{9-4}{36} \right)\]
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