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How many geometrical isomers are possibl...

How many geometrical isomers are possible in the following coordination entities.
i) `[Cr(C_2 O_4)_3]^(3-)`
ii) `[Co(NH_3)_3 Cl_3]`

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(i) .[Cr(C, O_s)_3]^3--. No geometrical isomers are possible. (ii) .[Co(NH_3)_3 Cl_3]-. Two geometrical isomers (fac - and mer - ) are possible.
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