Write the name, the state of hybridization, the shape and the magnetic behaviour of the following complexes :
`[CoCl_(4)]^(2-),[Ni(CN_(4)]^(2-), [Cr(H_(2)O)_(2)(C_(2)O_(4))_ (2)]^(-)`
` ("At.No.": Co= 27, Ni = 28, Cr = 24)`

Explanation

(i) `sp^(3)`, tetrahedral, paramagnetic (ii) `dsp^(2)`, square planar, diamagnetic (iii) `d^(2)sp^(3)`, octahedral, paramagnetic] (ii) `dsp^(2)`, square planar, diamagnetic (iii) `d^(2)sp^(3)`, octahedral, paramagnetic]