Complex with the largest crystal field splitting

1. A.
   $\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$
2. B.
   $\left\lbrack Mo\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$
3. C.
   $\left\lbrack Fe\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$
4. D.
   $\left\lbrack Os\left( H_{2}O \right)_{6} \right\rbrack^{3 +}$

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1. A.
   $\left\lbrack FeF_{6} \right\rbrack^{3 -}$
2. B.
   $\left\lbrack Fe\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -}$
3. C.
   $\left\lbrack Fe(CN)_{6} \right\rbrack^{3 -}$
4. D.
   $\left\lbrack Fe\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}$

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1. A.
   $\left\lbrack Cr\left( {OH}_{2} \right)_{6} \right\rbrack^{3 +}$
2. B.
   $\left\lbrack Ti\left( {OH}_{2} \right)_{6} \right\rbrack^{3 +}$
3. C.
   $\left\lbrack Fe\left( {OH}_{2} \right)_{6} \right\rbrack^{3 +}$
4. D.
   $\left\lbrack Mn\left( {OH}_{2} \right)_{6} \right\rbrack^{3 +}$

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1. A.
   II $<$ III $<$ I $<$ IV
2. B.
   IV $<$ III $<$ II $<$ I
3. C.
   I $<$ II $<$ IV $<$ III
4. D.
   III $<$ II $<$ IV $<$ I

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