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CBSE Class 12-science Answered

Why [Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2- is dimagnetic?
Asked by Topperlearning User | 07 Apr, 2014, 10:06: AM
answered-by-expert Expert Answer

Chromium in [Cr(NH3)6]3+ is in +3 oxidation state and has electronic configuration of [Ar]3d54s1.

Cr3+ ion provides six empty orbitals to accommodate six pairs of electrons from six molecules of ammonia. The resulting complex involves d2sp3 hybridisation and is octahedral. Due to the presence of these unpaired electrons in the complex it is paramagnetic in nature.

Nickel in [Ni(CN)4]2- is in +2 oxidation state and has electronic configuration of [Ar]3d104s2.

dsp2 hybrid orbitals accommodate four pairs of electrons from four CN groups and the resulting square planner complex is diamagnetic due to the absence of unpaired electrons.

Answered by | 07 Apr, 2014, 12:06: PM
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