Order of ligand field strength (spectrochemical series)

1. A.
   $CO <$ en $< {NH}_{3} < C_{2}O_{4}^{2 -} < S^{2 -}$
2. B.
   ${NH}_{3} <$ en $< CO < S^{2 -} < C_{2}O_{4}^{2 -}$
3. C.
   $S^{2 -} < C_{2}O_{4}^{2 -} < {NH}_{3} <$ en $< CO$
4. D.
   $S^{2 -} < {NH}_{3} <$ en $< CO < C_{2}O_{4}^{2 -}$

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1. A.
   $CO > H_{2}O > F^{-} > S^{2 -}$
2. B.
   ${OH}^{-} > F^{-} > {NH}_{3} > {CN}^{-}$
3. C.
   ${NCS}^{-} > {EDTA}^{4 -} > {CN}^{-} > CO$
4. D.
   $S^{2 -} > {OH}^{-} > {EDTA}^{4 -} > CO$

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1. A.
   ${Cl}^{-} < - OH < {Br}^{-} < {CN}^{-}$
2. B.
   $F^{-} < {Br}^{-} < I^{-} < {NH}_{3}$
3. C.
   ${Br}^{-} < F^{-} < H_{2}O < {NH}_{3}$
4. D.
   $H_{2}O < \ ^{-}OH < {CN}^{-} < {NH}_{3}$

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