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Find the number of diamagnetic complexes...

Find the number of diamagnetic complexes which show geometrical isomerism :
`(a) [NiF_(6)]^(2-)," "(b) [Pt(NH_(3))_(2)Cl_(2)],`
`(c ) [CoF_(3)(H_(2)O)]," "(d) [Fe(en)_(2)Cl_(2)]Cl,`
`(e ) [Ni(NH_(3))_(2)Cl_(2)," "(f) [Ni(PPh_(3))_(2)Cl_2]`

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The correct Answer is:
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