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Chemistry Question on coordination compounds

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

A

[Ni(NH3)6]2+[Ni(NH_3)_6]^{2+}

B

[Zn(NH3)6]2+[Zn(NH_3)_6 ]^{2+}

C

[Cr(NH3)6]3+[Cr(NH_3)_6]^{3+}

D

[Co(NH3)6]3+[Co (NH_3)_6]^{3+}

Answer

[Ni(NH3)6]2+[Ni(NH_3)_6]^{2+}

Explanation

Solution

[Ni(NH3)6]2+\left[ Ni \left( NH _{3}\right)_{6}\right]^{2+} Weak ligand with two unpaired electron.