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The total possible co-ordination isomers...

The total possible co-ordination isomers for the following compounds respectively are
(i) `[Co(en)_(3)][Cr(C_(2)O_(4))_(3)]`
(ii) `[Cu(NH_(3))_(4)][CuCl_(4)]`
(iii) `[Ni(en)_(3)][Co(NO_(2))_(6)]`

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The correct Answer is:
3
`1) [Cr("en")_(3)]^(3+) , [Co(NO_(2))_(6)]^(3-)`
2) `[Cr("en")_(2) (NO_(2))_(2)]^(+) , [Co"en" (NO_(2))_(4)]^(-)`
3) `[Co("en")_(2) (NO_(2))_(2)]^(+) , [Cr"en" (NO_(2))_(4)]^(-)`
4) `[Co("en")_(3)]^(3+) , [Cr(NO_(2))_(6)]^(3-)`
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The compexes [Co(NH_(3))_(6)][Cr(C_(2)O_(4))_(3)] and [Cr(NH_(3))_(6)][Co(C_(2)O_(4))_(3)]

Indicate the type of isomerism exhibited by the following complexes and draw the structures for these isomers: (i) K[Cr(H_(2)O)_(2)(C_(2)O_(4))_(2) (ii) [Co(en)_(3)]Cl_(3) (iii) [Co(NH_(3))_(5)(NO_(2))](NO_(3))_(2) (iv) [Pt(NH_(3))(H_(2)O)Cl_(2)]

Which of the following can exhibit geometrical isomerism ? (i) [Co(NH_(3))_(4)Cl_(2)] (ii) [Co("en")_(3)]Cl_(2) (iii) [Co("en")_(2)(NO_(2))Cl] SCN (iv) [Co(NH_(3))_(6)][Cr(CN)_(6)]

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