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Which of the following statement (s) is ...

Which of the following statement (s) is (are) correct ?

A

hexacyanidoferrate (II) ion has four unpaired electrons in 3d -orbital

B

tetracyanidonickelate (II) ion is square planner

C

IUPAc name of` [Zn(OH)_4]^(–2)` ion is tetrahydroxidozine (II) ion

D

the coordination number of Cr in` [Cr(NH_3)_2(en)_2]^(+3)` is 6

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The correct Answer is:
B, D
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