Write the name, the structure and the magnetic behaviour of each one of the following complexes :
(i) `[Pt(NH_(3))_(2)Cl(NO_(2))]`
(ii) `[Co(NH_(3))_(4)Cl_(2)]Cl`
(iii) `Ni(CO)_(4)"
"`(Atomic nos, `Co = 27 , Ni = 28, Pt = 78`)

Explanation

(i) `K_4[Mn(CN)_6]`
IUPAC name : Potassium hexacyanomanganate (II)
`0.S= +2,Mn(II) : d^5`
C.n=6
stereochemistry =Octahedral
Conf. : `t_(2g) .^5d^2SP^3` (low spin), inner orbital complex, Paramagnetic
(ii) `[Co(NH_3)_5Cl]Cl_2`
IUPAC name : Pentaamminechloridocobalt (III) Chloride 0.S = + 3, CO(III) : `d^6` Stereochemistry = Octahedral`(d^2SP^3)`
Conf. : `t_(2g^6)`
No. of unpaired electrons , n = 0
Magnetic moment = 0(diamagnetic)
(iii) `k_2[Ni(CN)_4]`: see Q.23 (or part), Set-III, O.D. 2009.