Facial and meridional isomers

1. A.
   $90^{\circ}$
2. B.
   $90^{\circ}\& 120^{\circ}$
3. C.
   $180^{\circ}$
4. D.
   $90^{\circ}\& 180^{\circ}$

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1. A.
   $\left\lbrack Co\left( {NH}_{3} \right)_{3}\left( {NO}_{2} \right)_{3} \right\rbrack$
2. B.
   $\left\lbrack Co(en)_{3} \right\rbrack$
3. C.
   $\left\lbrack Co(en)_{2}{Cl}_{2} \right\rbrack$
4. D.
   $\left\lbrack Pt\left( {NH}_{3} \right)_{2}{Cl}_{2} \right\rbrack$

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1. A.
   $\left\lbrack Co\left( {NH}_{3} \right)_{3}{Cl}_{3} \right\rbrack$
2. B.
   $\left\lbrack Co\left( {NH}_{3} \right)_{4}{Cl}_{2} \right\rbrack^{+}$
3. C.
   $\left\lbrack Co(en)_{3} \right\rbrack^{3 +}$
4. D.
   $\left\lbrack Co(en)_{2}{Cl}_{2} \right\rbrack^{+}$

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