Find the total number of complexes / species which are paramagnetic.
`(a) [Co(NH_(3))_(6)]^(3+)," "(b) [Co(H_(2)O)_(6)]^(3+),`
`(c ) [Cr(NH_(3))_(6)]^(2+)," "(d) [CoF_(6)]^(3-),`
`(e ) K_(3)[PtCl_(3)(C_(2)H_(4))]," "(f) [Mn(NH_(3))_(6)]^(2+),`
`(g) [Fe(NH_(3))_(6)]^(2+)," "(h) NO_(2),`
`(i) ClO_(2)," "(j) [Pt(NH_(3))_(2)Cl_(2)`

Answer

6

Explanation

There are six compounds which are paramagnetic
(c )`[Cr(NH_(3))_(6)]^(2+),Cr^(2+),3d^(4),sp^(3)d^(2)` hybridisation, complex
(d) `[CoF_(6)]^(3-) Co^(3+),3d^(6),sp^(3)d^(2)` hy7bridisation, there will be four unpaired electrons
(e )`K_(3)[PtCl_(3)(C_(2)H_(4))]` diamagnetic
(f) `[Mn(NH_(3))_(6)]^(2+) 3d^(5)`,5 unpaired electrons, (paramagnetic).

(g) `[Fe(NH_(3))_(6)]^(2+)` paramagnetic (4 unpaired electrons)