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When [Ni(NH(3))(4)]^(2+) is treated with...

When `[Ni(NH_(3))_(4)]^(2+)` is treated with conc `HCI`, two compounds having the formula `Ni(NH_(3))(2)CI_(2)` are formed. A solution of I reacts with oxalic acid to form `Ni(NH_(3))_(2)(C_(2)O_(4))`. II does not react with oxalic acid. Deduce the configuration of I and II and the geometry of Ni (II) complexes .

Text Solution

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`[Ni(NH_(3))_(4)]^(2+)+2HClrarrunderset((A) and (B))([Ni(NH_(3))_(2)Cl_(2)])+2 NH_(3)`
Compound (A) is a cis-isomer which can easily form a chelate ring with the oxalate ligand

Both compound (A) and (B) are square planar and compound A (cis-form) can be converted into compound B (trans-form) by boiling with dilute HCl.
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